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Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Deferred Compensation Liability [Abstract]      
Investments $ 3.8 $ 6.0  
Deferred compensation obligations 3.8 6.0  
Decrease in fair value of investments (2.2)    
Decrease in fair value of deferred compensation obligations (2.2)    
U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 131.1 155.1 $ 157.7
U.S. Pension Plans [Member] | Fair Value Excluding Investments Measured at Net Asset Value [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 42.9 54.3  
U.S. Pension Plans [Member] | Investments Measured at Net Asset Value [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 88.2 100.8  
Money Market Investments [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 2.4 3.9  
Fixed Income Securities [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 8.7 9.4  
Pooled Equity Funds [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 17.9 27.7  
U.S. Government and Agency Securities [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 13.1 12.3  
Other [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 0.8 1.0  
Level 1 [Member] | U.S. Pension Plans [Member] | Fair Value Excluding Investments Measured at Net Asset Value [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 18.0 27.8  
Level 1 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 0.0 0.0  
Level 1 [Member] | Fixed Income Securities [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 0.0 0.0  
Level 1 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 17.9 27.7  
Level 1 [Member] | U.S. Government and Agency Securities [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 0.0 0.0  
Level 1 [Member] | Other [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 0.1 0.1  
Level 2 [Member] | U.S. Pension Plans [Member] | Fair Value Excluding Investments Measured at Net Asset Value [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 24.9 26.5  
Level 2 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 2.4 3.9  
Level 2 [Member] | Fixed Income Securities [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 8.7 9.4  
Level 2 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 0.0 0.0  
Level 2 [Member] | U.S. Government and Agency Securities [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 13.1 12.3  
Level 2 [Member] | Other [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets 0.7 0.9  
Level 3 [Member] | U.S. Pension Plans [Member]      
U.S. pension plan assets [Abstract]      
Fair value of plan assets $ 0.0 $ 0.0