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Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Apr. 12, 2017
Long-term Debt, by Current and Noncurrent [Abstract]      
Present value of lease obligations $ 65,800,000    
Other 7,500,000 $ 3,000,000.0  
Total debt 1,666,800,000 1,653,800,000  
Less: deferred financing costs 7,200,000 7,600,000  
Total debt, net 1,659,600,000 1,646,200,000  
Less: current portion 55,500,000 47,100,000  
Total long-term debt, net 1,604,100,000 1,599,100,000  
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 $ 600,000,000.0 $ 600,000,000.0  
Stated percentage 5.50% 5.50%  
2026 Senior Notes | Fair Value, Inputs, Level 2      
Line of Credit Facility [Abstract]      
Notes, fair value $ 600,300,000 $ 549,300,000  
2023 Senior Notes      
Long-term Debt, by Current and Noncurrent [Abstract]      
Senior notes $ 450,000,000.0 $ 450,000,000.0  
Stated percentage 5.625% 5.625%  
2023 Senior Notes | Fair Value, Inputs, Level 2      
Line of Credit Facility [Abstract]      
Notes, fair value $ 457,900,000 $ 435,600,000  
Securitized debt      
Long-term Debt, by Current and Noncurrent [Abstract]      
Securitized debt $ 76,000,000.0 $ 9,100,000  
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% 0.80%  
Financing and capital lease obligations      
Long-term Debt, by Current and Noncurrent [Abstract]      
Present value of lease obligations $ 65,800,000 $ 66,700,000  
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 19,400,000    
Foreign qualified cash 10,400,000    
2016 Credit Agreement | Term A Facility      
Long-term Debt, by Current and Noncurrent [Abstract]      
Line of credit 467,500,000 $ 525,000,000.0  
Line of Credit Facility [Abstract]      
Prepaid debt payment $ 50,000,000.0    
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) 1.75% 2.00%  
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) 1.75% 2.00%