Quarterly report pursuant to Section 13 or 15(d)

Debt - (Revolving Credit Agreement) (Details)

v3.8.0.1
Debt - (Revolving Credit Agreement) (Details) - Revolving credit agreement
3 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 1,500,000,000  
Borrowings outstanding $ 675,000,000 $ 150,000,000
Weighted average interest rate (percent) 5.00%  
Ratio of debt to EBITDA 3.5