Pension Plans - Schedule of Net Pension Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Service costs	$ 0.4	$ 0.4	$ 1.2	$ 1.2
Interest costs	0.3	0.3	0.8	0.7
Return on plan assets	(0.1)	0.0	(0.1)	0.0
Amortization of actuarial loss	0.3	0.2	0.8	0.6
Net pension period cost	$ 0.9	$ 0.9	$ 2.7	$ 2.5