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Pension and Other Post-retirement Benefits Net Periodic Pension Costs and Weighted Average Assumptions (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Service cost   $ 1.5
Interest cost   21.7
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1.5 1.5
Interest cost 21.3 $ 21.3
Expected return on plan assets (27.1)  
Net periodic pension costs $ (4.3)  
Discount rate 3.82%