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Debt (Details) - USD ($)
9 Months Ended 12 Months Ended
Oct. 16, 2019
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2016
Long-term Debt, by Current and Noncurrent [Abstract]        
Finance/capital lease obligations   $ 65,000,000.0    
Other   3,400,000 $ 3,000,000.0  
Total debt   1,576,100,000 1,653,800,000  
Less: deferred financing costs   6,500,000 7,600,000  
Total debt, net   1,569,600,000 1,646,200,000  
Less: current portion   60,100,000 47,100,000  
Total long-term debt, net   1,509,500,000 1,599,100,000  
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   $ 627,200,000 $ 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   $ 463,800,000 $ 435,600,000  
Securitized debt        
Long-term Debt, by Current and Noncurrent [Abstract]        
Securitized debt   $ 33,900,000 $ 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]        
Finance/capital lease obligations   $ 65,000,000.0 $ 66,700,000  
2019 Credit Agreement | Line of Credit        
Long-term Debt, by Current and Noncurrent [Abstract]        
Covenant netted cash   $ 51,200,000    
Commitment fee   0.25%    
2016 Credit Agreement | Line of Credit        
Line of Credit Facility [Abstract]        
Line of credit borrowing       $ 500,000,000.0
2016 Credit Agreement | Term Loan Facility | Line of Credit        
Line of Credit Facility [Abstract]        
Line of credit borrowing       500,000,000.0
2016 Credit Agreement | Delayed Draw Term Loan Facility | Line of Credit        
Line of Credit Facility [Abstract]        
Line of credit borrowing       $ 100,000,000.0
2016 Credit Agreement | Term A Facility        
Long-term Debt, by Current and Noncurrent [Abstract]        
Line of credit   $ 423,800,000 $ 525,000,000.0  
Line of Credit Facility [Abstract]        
Prepaid debt payment   $ 75,000,000.0    
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% 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% 2.00%  
Subsequent Event | 2019 Credit Agreement | Line of Credit        
Long-term Debt, by Current and Noncurrent [Abstract]        
Equity interest of subsidiary guarantor 100.00%      
Equity voting rights of subsidiary 65.00%      
Covenant letters of credit outstanding ratio $ 40,000,000.0      
Domestic and foreign qualified cash, maximum percentage 100.00%      
Domestic and foreign qualified cash, maximum $ 200,000,000.0      
Subsequent Event | 2019 Credit Agreement | Base Rate | Line of Credit        
Long-term Debt, by Current and Noncurrent [Abstract]        
Index rate or LIBOR plus (as a percent) 0.625%      
Subsequent Event | 2019 Credit Agreement | Eurocurrency Rate | Line of Credit        
Long-term Debt, by Current and Noncurrent [Abstract]        
Index rate or LIBOR plus (as a percent) 1.625%      
Subsequent Event | 2019 Credit Agreement | Line of Credit | Incremental Facility        
Line of Credit Facility [Abstract]        
Line of credit borrowing $ 550,000,000.0      
Subsequent Event | 2019 Credit Agreement | Line of Credit | Revolving Credit Facility        
Line of Credit Facility [Abstract]        
Line of credit borrowing 425,000,000.0      
Subsequent Event | 2019 Credit Agreement | Line of Credit | Term Loan Facility        
Line of Credit Facility [Abstract]        
Line of credit borrowing 425,000,000.0      
Subsequent Event | 2019 Credit Agreement | Line of Credit | Letter of Credit        
Line of Credit Facility [Abstract]        
Line of credit borrowing $ 60,000,000.0