Goodwill and Other Intangible Assets - Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Other Intangible Assets
Weighted average remaining expected life of finite lived intangible assets	14 years
Gross carrying amount	$ 810.2	$ 782.9
Accumulated amortization	288.4	277.7
Net carrying amount	521.8	505.2
Amortization expense for intangible assets with finite useful lives	53.9	$ 45.4	$ 44.5
Estimated amortization expense for the next five years
Year 1: Finite lived intangible assets amortization	48.5
Year 2: Finite lived intangible assets amortization	48.2
Year 3: Finite lived intangible assets amortization	47.0
Year 4: Finite lived intangible assets amortization	46.3
Year 5: Finite lived intangible assets amortization	$ 44.2