Affiliated Companies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Carrying amount, equity-method investments	$ 203.1		$ 203.1		$ 201.9
Carrying amount, investments not accounted for under the equity method	8.6		8.6		12.8
Purchases and royalty payments made to affiliates	47.6	$ 27.9	85.6	$ 60.4
Amount due and payable to affiliates	18.9		18.9		33.6
Sales to affiliates	3.1	$ 2.8	6.0	$ 5.0
Amount receivable from affiliates	$ 2.5		$ 2.5		$ 1.4