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Pension Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Deferred compensation arrangement, by type of deferred compensation [Line Items]        
Net periodic benefit cost expected In next fiscal year $ 3.3   $ 3.3  
Benefits paid 0.4 $ 0.2 0.6 $ 0.4
Expected future employer contributions, current fiscal year $ 1.3   $ 1.3  
Minimum        
Deferred compensation arrangement, by type of deferred compensation [Line Items]        
Termination benefits, salary period     1 month  
Maximum        
Deferred compensation arrangement, by type of deferred compensation [Line Items]        
Termination benefits, salary period     5 months