Investments in Unconsolidated Affiliates (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) item	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) item	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of joint ventures | item	1		1
Equity in earnings of unconsolidated affiliates	$ 17.1	$ 18.3	$ 70.2	$ 42.5
Assets
Current assets	2,007.0		2,007.0		$ 1,517.1
Total assets	4,764.1		4,764.1		2,845.2
Liabilities
Current liabilities	1,005.1		1,005.1		533.3
Total noncurrent liabilities	2,837.0		2,837.0		$ 1,721.6
Summarized Financial Information, Net Income
Gross profit	168.3	106.3	577.3	187.4
Net income (loss)			316.2	(58.8)
AmSty [Member]
Summarized Financial Information, Net Income
Net sales	433.4	269.7	1,351.9	817.3
Gross profit	49.3	39.6	189.2	78.1
Net income (loss)	$ 37.2	$ 27.5	$ 151.8	$ 39.3