Other Intangible Assets, Net and Goodwill - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill, Gross [Roll Forward]
Beginning balance	$ 1,308.8	$ 1,301.9
Acquisition	8.7	7.0
Purchase price adjustments	1.0	(0.1)
Ending balance	1,318.5	1,308.8
Accumulated Impairment			$ (93.7)	$ (93.7)	$ (93.7)
Goodwill, Net [Roll Forward]
Beginning balance	1,215.1	1,208.2
Acquisition	8.7	7.0
Purchase price adjustments	1.0	(0.1)
Ending balance	$ 1,215.1	$ 1,208.2	$ 1,224.8	$ 1,215.1	$ 1,208.2