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Pension and Employee Benefit Plans, Weighted-average Asset Allocations (Details) - Pension Plans [Member] - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target allocation 100.00%    
Plan assets 100.00% 100.00%  
Anticipated contributions for 2019 fiscal year $ 6.0    
Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target allocation 60.00%    
Plan assets 58.00% 58.00%  
Debt Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target allocation 38.00%    
Plan assets 38.00% 38.00%  
Cash and Cash Equivalents [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target allocation 2.00%    
Plan assets 4.00% 4.00%  
U.S. Plans [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Expected return on plan assets 7.50% 8.00% 8.00%
Expected return on plan assets for next fiscal year 7.50%