Investments in Affiliates and Other Related Party Transactions - Summarized Income Statement Data for Affiliates Accounted for under Equity Method (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income statement data:
Net sales	$ 1,670.0	$ 1,520.2	$ 2,000.4
Gross profit	89.2	75.9	172.8
Income before provision for income taxes	85.7	60.0	169.6
Net income attributable to affiliates	$ 53.5	$ 42.2	$ 117.8