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Restructuring and Other (Severance Liability Rollforward) (Details) - Severance liability - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Restructuring and Other Severance Liability    
Beginning balance $ 14.7 $ 22.2
Accruals 3.7 1.0
Severance payments (11.4) (12.1)
Ending balance $ 7.0 $ 11.1