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Long-term Debt - Debt Summary (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Jan. 19, 2017
Debt Instrument [Line Items]
Long-term debt	$ 2,490.6	$ 2,453.4
Less: Current maturities of long-term debt	(62.9)	(62.1)
Less: Debt discount	(2.5)	(2.8)
Less: Debt issuance costs	(33.2)	(38.4)
Long-term debt, net of current maturities and debt issuance costs	$ 2,392.0	2,350.1
Interest rate	5.625%
Secured credit facility \| Revolving Credit Facility due 2023
Debt Instrument [Line Items]
Long-term debt	$ 200.0	112.0
Secured credit facility \| Term Loan A Facility due 2023
Debt Instrument [Line Items]
Long-term debt	681.1	707.7
Secured credit facility \| Term Loan B-1 Facility due 2025
Debt Instrument [Line Items]
Long-term debt	1,120.3	1,128.7
Senior notes \| 5.625% Notes due 2027
Debt Instrument [Line Items]
Long-term debt	$ 400.0	400.0
Interest rate	5.625%		5.625%
Other long-term obligations
Debt Instrument [Line Items]
Long-term debt	$ 89.2	104.6
Capital leases
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 0.4