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Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 17, 2019
Sep. 30, 2018
Jun. 21, 2018
Debt Instrument [Line Items]        
Total long-term debt, including current maturities $ 3,627.1   $ 988.0  
Capital lease obligations 47.9   0.0  
Less current portion (11.6)   (4.0)  
Less unamortized debt discount and debt issuance fees (58.4)   (7.9)  
Total long-term debt 3,557.1   976.1  
Total gross long-term debt held in escrow 0.0   1,254.2  
Less unamortized debt issuance fees 0.0   (23.5)  
Long-term debt held in escrow 0.0   1,230.7  
Secured Debt | Senior Secured Term Loan A Facility due 2021        
Debt Instrument [Line Items]        
Total long-term debt, including current maturities 150.0   0.0  
Secured Debt | Senior Secured Term Loan B Facility due 2025        
Debt Instrument [Line Items]        
Total long-term debt, including current maturities 1,000.0   0.0  
Secured Debt | Senior Secured Term Loan B Facility due 2022        
Debt Instrument [Line Items]        
Total long-term debt, including current maturities 0.0   388.0  
Senior Notes | 5.50% Senior Notes due 2025        
Debt Instrument [Line Items]        
Total long-term debt, including current maturities $ 600.0   600.0  
Stated interest rate of debt 5.50% 7.75%    
Senior Notes | 6.375% Senior Notes due 2026        
Debt Instrument [Line Items]        
Total long-term debt, including current maturities $ 500.0   0.0  
Total gross long-term debt held in escrow $ 0.0   500.0  
Stated interest rate of debt 6.375%     6.375%
Senior Notes | 4.625% Senior Notes due 2026        
Debt Instrument [Line Items]        
Total long-term debt, including current maturities $ 729.2   0.0  
Total gross long-term debt held in escrow $ 0.0   754.2  
Stated interest rate of debt 4.25%     4.625%
Senior Notes | 7.750% Senior Notes due 2027        
Debt Instrument [Line Items]        
Total long-term debt, including current maturities $ 600.0   $ 0.0