Long-Term Debt - Schedule of Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
2021	$ 350.0
2022	0.0
2023	250.0
2024	521.8
2025	720.8
Thereafter	2,789.7
Outstanding principal	4,632.3	$ 4,800.0
Less: net discount	(5.9)	(5.9)
Less: debt issuance cost	(32.6)	(29.8)
Less: current maturities of long-term debt	(349.8)	0.0
Long-term debt	$ 4,244.0	$ 4,764.3

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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, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration 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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