Basis of Presentation (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain on sale of business		$ 0.0	$ 21.7	$ 0.0	$ 21.7
Accounting Standards Update [Extensible List]						us-gaap:AccountingStandardsUpdate201613Member
Cumulative effect from adoption of CECL accounting standard		(2,031.0)		(2,031.0)		$ (1,960.5)
Disposed of by sale | Haefely
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from disposal of business	$ 38.1
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect from adoption of CECL accounting standard		$ (2,366.0)	$ (2,227.5)	$ (2,366.0)	$ (2,227.5)	(2,279.4)	$ (2,308.4)	$ (2,143.8)	$ (2,064.4)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect from adoption of CECL accounting standard						$ 1.0