Long-Term Debt - Composition of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 3,937.4	$ 3,153.6
Less unamortized debt issuance costs	(44.0)	(39.2)
Less: current portion of long-term debt	(24.1)	(24.3)
Long-term debt, net of current portion	3,869.3	3,090.1
2024 Term Loans \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 1,794.9	$ 1,807.4
Effective interest rate percentage	2.30%	2.80%
2027 Term Loans \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 742.5	$ 746.2
Effective interest rate percentage	2.50%	3.00%
2027 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 600.0	$ 600.0
Effective interest rate percentage	5.40%	5.40%
2029 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 800.0	$ 0.0
Effective interest rate percentage	3.60%
Revolver \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 0.0

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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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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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