Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative Instruments - Gain (Loss) on the Company's Foreign Currency Forward Contracts Recorded in the Consolidated Statements of Operations and Comprehensive Income (Details)

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Derivative Instruments - Gain (Loss) on the Company's Foreign Currency Forward Contracts Recorded in the Consolidated Statements of Operations and Comprehensive Income (Details) - Foreign currency forward contracts - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Derivative [Line Items]      
Derivative instruments not designated as hedging instruments, gain (loss), net $ (4.5) $ 0.5 $ 4.7
Asbestos adjustments (gain) loss      
Derivative [Line Items]      
Derivative instruments not designated as hedging instruments, gain (loss), net (11.7) (0.8) 0.8
Selling, general and administrative expenses      
Derivative [Line Items]      
Derivative instruments not designated as hedging instruments, gain (loss), net $ 7.2 $ 1.3 $ 3.9