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Long-term Debt (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 16, 2017
Nov. 20, 2012
Dec. 09, 2010
Aug. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2017
Feb. 21, 2017
Feb. 20, 2017
Borrowings                    
Repayments of revolving credit facility         $ 1,189,000,000.0 $ 0 $ 0      
Unamortized discount and debt issuance costs         (13,800,000) (3,600,000)        
Total long-term debt         1,586,200,000 596,400,000        
Less current portion of long-term debt         0 0        
Total long-term debt, net of current portion         1,586,200,000 596,400,000        
Proceeds from revolving credit facility         1,189,000,000.0 0 0      
Cash payments for interest         29,600,000 35,900,000 $ 35,100,000      
3.75% Notes due 2027                    
Borrowings                    
Interest rate (as a percent) 3.75%                  
Long-term debt, carrying amount         $ 600,000,000.0 0        
Par Value $ 600,000,000.0                  
Proceeds from issuance of debt 597,600,000                  
Long-term debt redemption price, basis spread on variable discount rate (as a percent)         0.25%          
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                  
Unamortized discount $ (2,400,000)                  
3.75% Notes due 2027 | Significant Observable Inputs (Level 2)                    
Borrowings                    
Fair value of notes         $ 607,100,000 0        
3.5% Notes due 2024                    
Borrowings                    
Interest rate (as a percent) 3.50%                  
Long-term debt, carrying amount         $ 400,000,000.0 0        
Par Value $ 400,000,000.0                  
Proceeds from issuance of debt 399,600,000                  
Long-term debt redemption price, basis spread on variable discount rate (as a percent)         0.20%          
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                  
Unamortized discount $ (400,000)                  
3.5% Notes due 2024 | Significant Observable Inputs (Level 2)                    
Borrowings                    
Fair value of notes         $ 403,700,000 $ 0        
3.75% senior notes due 2022                    
Borrowings                    
Interest rate (as a percent)   3.75%     3.75% 3.75%        
Long-term debt, carrying amount         $ 350,000,000.0 $ 350,000,000.0        
Par Value   $ 350,000,000.0                
Proceeds from issuance of debt   348,900,000                
Long-term debt redemption price, basis spread on variable discount rate (as a percent)         0.35%          
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                
Unamortized discount   $ (1,100,000)                
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2)                    
Borrowings                    
Fair value of notes         $ 358,900,000 $ 347,200,000        
5.125% senior notes due 2020                    
Borrowings                    
Interest rate (as a percent)     5.125%   5.125% 5.125%        
Long-term debt, carrying amount         $ 250,000,000.0 $ 250,000,000.0        
Par Value     $ 250,000,000.0              
Proceeds from issuance of debt     248,900,000              
Long-term debt redemption price, description of variable discount rate         Treasury Rate          
Long-term debt redemption price, basis spread on variable discount rate (as a percent)         0.35%          
Percentage of principal amount at which the entity may redeem some or all of the notes prior to specified date         100.00%          
Percentage of principal amount at which the entity may redeem some or all of the notes after specified date         100.00%          
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              
Unamortized discount     $ (1,100,000)              
5.125% senior notes due 2020 | Change-in-control                    
Borrowings                    
Percentage of the principal amount at which the notes are redeemable         101.00%          
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2)                    
Borrowings                    
Fair value of notes         $ 264,800,000 $ 263,100,000        
6.125% senior notes due 2016                    
Borrowings                    
Interest rate (as a percent)       6.125%   6.125%        
Repayment of debt       $ 150,000,000.0            
Revolving credit facility                    
Borrowings                    
Remaining borrowing capacity         1,000,000,000.0          
Interest on borrowings         $ 0 $ 0        
Revolving credit facility | Credit Agreement                    
Borrowings                    
Maximum borrowing capacity                 $ 1,000,000,000.0 $ 600,000,000.0
Debt Issuance Costs, Line of Credit Arrangements, Gross               $ 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