Quarterly report pursuant to Section 13 or 15(d)

Debt - (Interest Rate Swaps) (Details)

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Debt - (Interest Rate Swaps) (Details)
Mar. 31, 2018
USD ($)
February 15, 2021  
Debt Instrument [Line Items]  
Notional amount of interest rate swap agreements $ 600,000,000
May 15, 2022  
Debt Instrument [Line Items]  
Notional amount of interest rate swap agreements 500,000,000
February 15, 2024  
Debt Instrument [Line Items]  
Notional amount of interest rate swap agreements 1,000,000,000
January 15, 2025  
Debt Instrument [Line Items]  
Notional amount of interest rate swap agreements 600,000,000
Interest rate swap  
Debt Instrument [Line Items]  
Notional amount of interest rate swap agreements $ 2,700,000,000
Average variable rate, interest rate swap agreements (percent) 3.61%
Weighted average rate, interest rate swap agreements (percent) 5.44%