Long-Term Debt - Schedule of Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
2020	$ 0.0
2021	850.0
2022	0.0
2023	0.0
2024	900.0
Thereafter	3,050.0
Subtotal	4,800.0	$ 4,461.4
Less: net discount	(5.9)	(6.1)
Less: debt issuance cost	(29.8)	(24.5)
Less: current maturities of long-term debt	0.0	(399.8)
Long-term debt	$ 4,764.3	$ 4,031.0

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