Financing Arrangements - Components of Long-Term Debt (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	May 13, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal Amount		$ 1,888.4		$ 1,242.8
Unamortized discount and debt issuance cost		20.7		13.5
Long-term Debt, Total		1,867.7		1,229.3
Less short-term and current portion of long-term debt, Principal Amount		18.0		18.4
Less short-term and current portion of long-term debt, Unamortized discount and debt issuance cost		0.0		0.0
Less short-term and current portion of long-term debt		18.0		18.4
Total long-term debt, gross, net of current		1,870.4		1,224.4
Debt excluding current, unamortized discount and debt issuance costs		20.7		13.5
Total long-term debt, net of current portion		1,849.7		1,210.9
Senior secured revolving credit facility due 2022 | Revolving Credit Facility
Debt Instrument [Line Items]
Principal Amount		0.0		0.0
Unamortized discount and debt issuance cost		0.0		0.0
Long-term Debt, Total		$ 0.0		0.0
Weighted average interest rate	3.90%	0.00%
Senior secured term loan due 2026 | Secured Debt
Debt Instrument [Line Items]
Principal Amount		$ 621.2		624.5
Unamortized discount and debt issuance cost		8.7		9.8
Long-term Debt, Total		$ 612.5		$ 614.7
Weighted average interest rate	4.01%	2.81%
5.25% Senior Notes Due 2023 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage		5.25%		5.25%
Principal Amount		$ 600.0		$ 600.0
Unamortized discount and debt issuance cost		3.1		3.7
Long-term Debt, Total		$ 596.9		596.3
Weighted average interest rate	5.25%	5.25%
5.75% Senior Notes Due 2025 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage		5.75%	5.75%
Principal Amount		$ 650.0
Unamortized discount and debt issuance cost		8.9
Long-term Debt, Total		$ 641.1
Weighted average interest rate		5.75%
Other Debt
Debt Instrument [Line Items]
Principal Amount		$ 17.2		18.3
Unamortized discount and debt issuance cost		0.0		0.0
Long-term Debt, Total		$ 17.2		$ 18.3