Debt - Summary of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized discount and issuance costs	$ (26.9)	$ (31.0)
Long-term debt, gross	2,140.2	2,152.5
Less: Current Portion	(21.8)	(22.0)
Total long-term debt, net of current portion	$ 2,118.4	$ 2,130.5
Term Loan due 2027 at 2.83% and 3.15% at September 30, 2021 and December 31, 2020, respectively. \| Revolving Credit Facility
Debt Instrument [Line Items]
Weighted average borrowing rate	2.83%	3.15%
Long-term debt, gross	$ 2,167.1	$ 2,183.5

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Weighted average interest rate of debt outstanding.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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