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Long-term Debt - Debt Summary (Details) - USD ($) $ in Millions	Sep. 30, 2020	May 31, 2020	Dec. 31, 2019	Jan. 31, 2017
Debt Instrument [Line Items]
Principal	$ 2,566.1		$ 2,419.0
Less: Current maturities of long-term debt	(84.8)		(62.9)
Less: Debt discount	(89.6)		(2.4)
Less: Debt issuance costs	(36.0)		(31.5)
Long-term debt, net of current maturities, debt discount and debt issuance costs	$ 2,355.7		2,322.2
Interest rate	5.625%
Senior Secured Credit Facilities \| Revolving Credit Facility due 2023
Debt Instrument [Line Items]
Principal	$ 0.0		140.0
Senior Secured Credit Facilities \| Term Loan A Facility due 2023
Debt Instrument [Line Items]
Principal	645.8		672.3
Senior Secured Credit Facilities \| Term Loan B-1 Facility due 2025
Debt Instrument [Line Items]
Principal	1,109.0		1,117.5
Senior Notes \| 5.625% Notes due 2027
Debt Instrument [Line Items]
Principal	$ 400.0		$ 400.0
Interest rate	5.625%		5.625%	5.625%
Convertible Notes \| 2.75% Convertible Notes due 2026
Debt Instrument [Line Items]
Principal	$ 330.5		$ 0.0
Interest rate	2.75%	2.75%
Other long-term obligations
Debt Instrument [Line Items]
Principal	$ 80.8		$ 89.2