Affiliated Companies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Carrying amount, equity-method investments	$ 201.3		$ 201.9
Carrying amount, investments not accounted for under the equity method	10.6		12.8
Purchases and royalty payments made to affiliates	38.0	$ 32.5
Amount due and payable to affiliates	18.9		33.6
Sales to affiliates	2.9	$ 2.2
Amount receivable from affiliates	$ 1.7		$ 1.4