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Investments - Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Equity Securities          
Equity method investments, beginning balance   $ 99.6   $ 99.6  
New investments       3.4  
Realized gain on equity method investment $ 0.3   $ 0.0 0.3 $ 0.0
Equity in (loss) earnings of unconsolidated affiliates, net       (0.6) $ 0.2
Foreign currency translation adjustments and other       (2.8)  
Equity method investments, ending balance 97.0     97.0  
Equity Method Investment, Nonconsolidated Investee or Group of Investees          
Equity Securities          
Equity method investments, beginning balance   99.6   99.6  
New investments       0.5  
Reclassification due to acquisition of investee       (0.8)  
Realized gain on equity method investment   $ 0.3      
Equity in (loss) earnings of unconsolidated affiliates, net       (0.6)  
Foreign currency translation adjustments and other       (2.0)  
Equity method investments, ending balance $ 97.0     $ 97.0