Investments - Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity Securities
Equity method investments, beginning balance	$ 99.6	$ 5.3
New investments	0.5	58.7
Realized gain on investment in equity securities	0.3	0.0	$ 0.0
Reclassification from investments in equity securities to equity method investments		36.8
Reclassification due to acquisition of investee	(0.5)	7.6
Equity in earnings of unconsolidated affiliates, net	(0.5)	0.4
Foreign currency translation adjustments and other	(6.4)	(1.6)
Equity method investments, ending balance	$ 93.0	$ 99.6	$ 5.3