Pension Plans (Schedule of Net Pension Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Retirement Benefits [Abstract]
Service costs	$ 0.4	$ 0.4
Interest costs	0.3	0.2
Amortization of actuarial loss	0.3	0.2
Net pension period cost	$ 1.0	$ 0.8