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Debt (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Apr. 12, 2017
Long-term Debt, by Current and Noncurrent [Abstract]      
Other $ 41,000,000 $ 36,700,000  
Total debt 1,792,600,000 1,762,500,000  
Less: deferred financing costs (8,500,000) (9,400,000)  
Total debt, net 1,784,100,000 1,753,100,000  
Less: current portion (77,300,000) (72,400,000)  
Total long-term debt, net 1,706,800,000 1,680,700,000  
Revolving Credit Facility      
Line of Credit Facility [Abstract]      
Maximum borrowing capacity     $ 120,000,000.0
2026 Senior Notes      
Long-term Debt, by Current and Noncurrent [Abstract]      
Senior notes $ 600,000,000 $ 600,000,000  
Stated percentage 5.50% 5.50%  
2026 Senior Notes | Fair Value, Inputs, Level 2      
Line of Credit Facility [Abstract]      
Notes, fair value $ 581,500,000 $ 618,100,000  
2023 Senior Notes      
Long-term Debt, by Current and Noncurrent [Abstract]      
Senior notes $ 450,000,000.0 $ 450,000,000  
Stated percentage 5.625% 5.625%  
2023 Senior Notes | Fair Value, Inputs, Level 2      
Line of Credit Facility [Abstract]      
Notes, fair value $ 451,100,000 $ 470,900,000  
Securitized debt      
Long-term Debt, by Current and Noncurrent [Abstract]      
Securitized debt $ 92,400,000 49,000,000  
Securitized debt | London Interbank Offered Rate (LIBOR)      
Long-term Debt, by Current and Noncurrent [Abstract]      
Index rate or LIBOR plus (as a percent) 0.80%    
Capital lease obligations      
Long-term Debt, by Current and Noncurrent [Abstract]      
Capital lease obligations $ 69,200,000 71,800,000  
2016 Credit Agreement | Line of Credit      
Line of Credit Facility [Abstract]      
Maximum percentage of domestic qualified cash allowed to be subtracted from consolidated funded debt 100.00%    
Maximum percentage of foreign qualified cash allowed to be subtracted from consolidated funded debt 60.00%    
Maximum amount of domestic and foreign qualified cash allowed to be subtracted from consolidated funded debt $ 150,000,000.0    
Domestic qualified cash 15,300,000    
Foreign qualified cash 10,400,000    
2016 Credit Agreement | Term A Facility      
Long-term Debt, by Current and Noncurrent [Abstract]      
Line of credit $ 540,000,000 $ 555,000,000  
2016 Credit Agreement | Term A Facility | London Interbank Offered Rate (LIBOR)      
Long-term Debt, by Current and Noncurrent [Abstract]      
Index rate or LIBOR plus (as a percent) 2.00% 1.75%  
2016 Credit Agreement | Revolver      
Long-term Debt, by Current and Noncurrent [Abstract]      
Line of credit $ 0 $ 0  
2016 Credit Agreement | Revolver | London Interbank Offered Rate (LIBOR)      
Long-term Debt, by Current and Noncurrent [Abstract]      
Index rate or LIBOR plus (as a percent) 2.00% 1.75%