Quarterly report pursuant to Section 13 or 15(d)

Debt (Narrative) (Details)

v3.2.0.727
Debt (Narrative) (Details)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
EUR (€)
Jan. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Apr. 30, 2014
USD ($)
May. 31, 2011
USD ($)
Debt Instrument [Line Items]              
Derivative, notional amount       $ 200      
Revolving credit facility, maximum borrowing capacity $ 500 $ 500          
Revolving credit facility, due date   Jun. 01, 2018          
Line of credit, minimum carrying amount of unrestricted cash 100 $ 100          
Revolving credit agreement $ 150 $ 150     $ 75    
Line of credit facility, covenant terms   The agreement contains non-financial and financial covenants, including requirements of minimum fixed charge coverage ratios, maximum debt-to-EBITDA ratios and minimum tangible net worth. The Company is required to not exceed a maximum debt-to-EBITDA ratio of 3.0 to 1.0.          
Ratio of debt to EBITDA   3.0          
Weighted average interest rate 3.75% 3.75% 3.75%        
Senior notes, effective yield 1.64% 1.64% 1.64%        
Maximum exposure, undiscounted $ 260 $ 260          
4.75% Add-on Notes [Member]              
Debt Instrument [Line Items]              
Senior notes, at par       $ 200   $ 300  
Interest rate, stated       4.75%   4.75%  
5.75% Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior notes, at par             $ 425
4.75% Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior notes, at par 500 500          
Ribera Salud [Member]              
Debt Instrument [Line Items]              
Letters of credit outstanding, amount 53 53 € 48        
Non Revolver Letter of Credit [Member]              
Debt Instrument [Line Items]              
Letters of credit outstanding, amount $ 47 $ 47          
$200 Million Interest Rate Swap [Member]              
Debt Instrument [Line Items]              
Variable rate of swap, percentage 2.88% 2.88% 2.88%        
Interest Rate Swap [Member]              
Debt Instrument [Line Items]              
Derivative, notional amount $ 750 $ 750          
Variable rate of swap, percentage 2.85% 2.85% 2.85%        
Weighted average interest rate, interest rate swap agreements 3.12% 3.12% 3.12%        
June 1, 2017 Expiration [Member]              
Debt Instrument [Line Items]              
Derivative, notional amount $ 250 $ 250          
Interest rate swap agreements expire date June 1, 2017            
May 15, 2022 Expiration [Member]              
Debt Instrument [Line Items]              
Derivative, notional amount $ 500 $ 500          
Interest rate swap agreements expire date May 15, 2022            
5.75% Senior Notes, Due June 1, 2017 [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Interest rate, stated 5.75% 5.75% 5.75%