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Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Jun. 21, 2018
Debt Instrument [Line Items]      
Total long-term debt, including current maturities $ 987.0 $ 988.0  
Less current portion (4.0) (4.0)  
Less unamortized debt discount and debt issuance fees (7.6) (7.9)  
Total long-term debt 975.4 976.1  
Total gross long-term debt held in escrow 2,445.2 1,254.2  
Less current portion (60.0) 0.0  
Less unamortized debt issuance fees (39.0) (23.5)  
Long-term debt held in escrow 2,346.2 1,230.7  
Secured Debt | Senior Secured Term Loan B Facility due 2022      
Debt Instrument [Line Items]      
Total long-term debt, including current maturities 387.0 388.0  
Secured Debt | Senior Secured Term Loan B Facility due 2025      
Debt Instrument [Line Items]      
Total gross long-term debt held in escrow 1,000.0 0.0  
Secured Debt | Senior Secured Term Loan A Facility due 2021      
Debt Instrument [Line Items]      
Total gross long-term debt held in escrow 200.0 0.0  
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%    
Senior Notes | 6.375% Senior Notes due 2026      
Debt Instrument [Line Items]      
Total gross long-term debt held in escrow $ 500.0 500.0  
Stated interest rate of debt 6.375%   6.375%
Senior Notes | 4.625% Senior Notes due 2026      
Debt Instrument [Line Items]      
Total gross long-term debt held in escrow $ 745.2 $ 754.2  
Stated interest rate of debt 4.25%   4.625%