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Long-term Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Borrowings    
Unamortized discount, debt issuance costs, and other $ (11,500,000) $ (12,200,000)
Long-term debt 1,588,500,000 1,587,800,000
Letters of credit outstanding 26,200,000 26,000,000.0
3.75% senior notes due 2027    
Borrowings    
Long-term debt, carrying amount $ 600,000,000.0 $ 600,000,000.0
Interest rate (as a percent) 3.75% 3.75%
3.75% senior notes due 2027 | Significant Observable Inputs (Level 2)    
Borrowings    
Fair value of notes $ 582,700,000 $ 579,400,000
3.5% senior notes due 2024    
Borrowings    
Long-term debt, carrying amount $ 400,000,000.0 $ 400,000,000.0
Interest rate (as a percent) 3.50% 3.50%
3.5% senior notes due 2024 | Significant Observable Inputs (Level 2)    
Borrowings    
Fair value of notes $ 397,500,000 $ 386,400,000
3.75% senior notes due 2022    
Borrowings    
Long-term debt, carrying amount $ 350,000,000.0 $ 350,000,000.0
Interest rate (as a percent) 3.75% 3.75%
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2)    
Borrowings    
Fair value of notes $ 353,300,000 $ 345,500,000
5.125% senior notes due 2020    
Borrowings    
Long-term debt, carrying amount $ 250,000,000.0 $ 250,000,000.0
Interest rate (as a percent) 5.125% 5.125%
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2)    
Borrowings    
Fair value of notes $ 255,900,000 $ 255,000,000.0
Revolving credit facility    
Borrowings    
Borrowings under the facility 0  
Repayments of the facility 0  
Revolving credit facility 0 0
Availability under revolving line of credit 1,000,000,000.0 $ 1,000,000,000.0
Letter of credit | Credit Agreement    
Borrowings    
Maximum borrowing capacity 80,000,000.0  
Availability under revolving line of credit $ 56,100,000