Pensions (Details) - Pension [Member] - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 1.5	$ 1.3
Components of net periodic benefit cost [Abstract]
Service cost	0.1	0.1
Interest cost	2.4	3.0
Expected return on plan assets	(3.0)	(4.3)
Amortization of unrecognized net loss	1.4	1.8
Net periodic benefit cost	$ 0.9	$ 0.6