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Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Fair Value Measurements [Abstract]      
Investments $ 2.8 $ 3.8  
Deferred compensation obligations 2.8 3.8  
Decrease in fair value of investments $ (1.0)    
Notice period for redeeming real estate investment funds 90 days    
Notice period for redeeming fixed income investment funds 60 days    
U.S. Pension Plans [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets $ 183.3 131.1 $ 155.1
U.S. Pension Plans [Member] | Money Market Investments [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 2.5 2.4  
U.S. Pension Plans [Member] | Fixed Income Securities [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 8.9 8.7  
U.S. Pension Plans [Member] | Pooled Equity Funds [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 37.3 17.9  
U.S. Pension Plans [Member] | U.S. Government and Agency Securities [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 14.5 13.1  
U.S. Pension Plans [Member] | Other [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 1.1 0.8  
U.S. Pension Plans [Member] | Total [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 64.3 42.9  
U.S. Pension Plans [Member] | Level 1 [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 37.4 18.0  
U.S. Pension Plans [Member] | Level 1 [Member] | Money Market Investments [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 0.0 0.0  
U.S. Pension Plans [Member] | Level 1 [Member] | Fixed Income Securities [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 0.0 0.0  
U.S. Pension Plans [Member] | Level 1 [Member] | Pooled Equity Funds [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 37.3 17.9  
U.S. Pension Plans [Member] | Level 1 [Member] | U.S. Government and Agency Securities [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 0.0 0.0  
U.S. Pension Plans [Member] | Level 1 [Member] | Other [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 0.1 0.1  
U.S. Pension Plans [Member] | Level 2 [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 26.9 24.9  
U.S. Pension Plans [Member] | Level 2 [Member] | Money Market Investments [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 2.5 2.4  
U.S. Pension Plans [Member] | Level 2 [Member] | Fixed Income Securities [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 8.9 8.7  
U.S. Pension Plans [Member] | Level 2 [Member] | Pooled Equity Funds [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 0.0 0.0  
U.S. Pension Plans [Member] | Level 2 [Member] | U.S. Government and Agency Securities [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 14.5 13.1  
U.S. Pension Plans [Member] | Level 2 [Member] | Other [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 1.0 0.7  
U.S. Pension Plans [Member] | Level 3 [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets 0.0 0.0  
U.S. Pension Plans [Member] | Net Asset Value [Member]      
Fair Value Measurements [Abstract]      
Fair value of plan assets $ 119.0 $ 88.2