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Investments (Investments by Category) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Equity Method Investments, and Investments in Debt and Equity Securities [Abstract]    
Investments in equity method investees $ 58.8 $ 30.1
Other investments 2.3 1.8
Investments $ 61.1 $ 31.9