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Long-term Debt (Details) - USD ($)
12 Months Ended
Nov. 16, 2017
Nov. 20, 2012
Dec. 09, 2010
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Feb. 21, 2017
Feb. 20, 2017
Borrowings                  
Unamortized discount and debt issuance costs       $ (8,400,000) $ (12,200,000)        
Total long-term debt       1,591,600,000 1,587,800,000        
Current portion of debt       250,200,000 0        
Total long term-debt, net of current portion       $ 1,341,400,000 1,587,800,000        
Percentage of principal amount at which the entity may redeem some or all of the notes prior to specified date       100.00%          
Long-term debt redemption price, description of variable discount rate       Treasury Rate          
Percentage of principal amount at which the entity may redeem some or all of the notes after specified date       100.00%          
Percentage of the principal amount at which the notes are redeemable, upon a change in control       101.00%          
Proceeds from revolving credit facility       $ 0 0 $ 1,189,000,000.0      
Repayments of revolving credit facility       0 0 1,189,000,000.0      
Letters of credit outstanding       25,500,000 26,000,000.0        
Cash payments for interest       63,700,000 65,400,000 29,600,000      
3.75% Notes due 2027                  
Borrowings                  
Long-term debt, carrying amount       $ 600,000,000.0 600,000,000.0        
Interest rate (as a percent) 3.75%                
Par value $ 600,000,000.0                
Unamortized discount 2,400,000                
Proceeds from issuance of debt 597,600,000                
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets $ 7,700,000                
Long-term debt redemption price, basis spread on variable discount rate (as a percent)       25.00%          
3.75% Notes due 2027 | Significant Observable Inputs (Level 2)                  
Borrowings                  
Fair value of notes       $ 623,400,000 579,400,000        
3.5% Notes due 2024                  
Borrowings                  
Long-term debt, carrying amount       $ 400,000,000.0 400,000,000.0        
Interest rate (as a percent) 3.50%                
Par value $ 400,000,000.0                
Unamortized discount 400,000                
Proceeds from issuance of debt 399,600,000                
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets $ 4,500,000                
Long-term debt redemption price, basis spread on variable discount rate (as a percent)       20.00%          
3.5% Notes due 2024 | Significant Observable Inputs (Level 2)                  
Borrowings                  
Fair value of notes       $ 414,200,000 386,400,000        
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%              
Par value   $ 350,000,000.0              
Unamortized discount   1,100,000              
Proceeds from issuance of debt   348,900,000              
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets   $ 2,900,000              
Long-term debt redemption price, basis spread on variable discount rate (as a percent)       35.00%          
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2)                  
Borrowings                  
Fair value of notes       $ 361,400,000 345,500,000        
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%            
Par value     $ 250,000,000.0            
Unamortized discount     1,100,000            
Proceeds from issuance of debt     248,900,000            
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets     $ 1,900,000            
Long-term debt redemption price, basis spread on variable discount rate (as a percent)       35.00%          
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2)                  
Borrowings                  
Fair value of notes       $ 255,000,000.0 255,000,000.0        
Revolving credit facility                  
Borrowings                  
Remaining borrowing capacity       1,000,000,000.0          
Revolving credit facility                  
Borrowings                  
Proceeds from revolving credit facility       0 0 1,200,000,000      
Repayments of revolving credit facility       0 $ 0 $ 1,200,000,000      
Revolving credit facility | Credit Agreement                  
Borrowings                  
Maximum borrowing capacity               $ 1,000,000,000.0 $ 600,000,000.0
Debt issuance costs on line of credit             $ 1,400,000    
Line of credit, additional borrowing capacity               500,000,000.0  
Letter of Credit | Credit Agreement                  
Borrowings                  
Maximum borrowing capacity               $ 50,000,000.0  
Letter of Credit | Revolving credit facility                  
Borrowings                  
Maximum borrowing capacity       80,000,000.0          
Remaining borrowing capacity       $ 54,500,000