Pensions (Details) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Components of net periodic benefit cost [Abstract]
Net periodic benefit cost	[1]	$ 0.8	$ 0.7
Pension [Member]
Components of net periodic benefit cost [Abstract]
Service cost		0.1	0.1
Interest cost		2.5	2.4
Expected return on plan assets		(3.0)	(3.0)
Amortization of unrecognized net loss		1.4	1.4
Net periodic benefit cost		1.0	0.9
Pension [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 1.9	$ 1.5

[1] Represents net periodic benefit cost, exclusive of service cost, for the Company's pension and postretirement plans.