Goodwill and Other Intangible Assets - Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Asset Disclosures
Weighted average remaining expected life of finite lived intangible assets	17 years
Gross carrying amount	$ 1,338.2	$ 1,346.3
Accumulated amortization	405.6	343.2
Net carrying amount	932.6	1,003.1
Amortization expense for intangible assets with finite useful lives	73.5	$ 62.8	$ 53.9
Estimated amortization expense for the next five years
Year 1: Finite lived intangible assets amortization	75.1
Year 2: Finite lived intangible assets amortization	73.9
Year 3: Finite lived intangible assets amortization	71.2
Year 4: Finite lived intangible assets amortization	70.0
Year 5: Finite lived intangible assets amortization	68.2
Other finite lived intangible assets
Finite Lived Intangible Asset Disclosures
Amortization expense for intangible assets with finite useful lives	$ 18.7