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Pensions (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Components of net periodic benefit cost [Abstract]
Net periodic benefit cost	[1]	$ 0.8	$ 0.8	$ 1.6	$ 1.5
Pension [Member]
Components of net periodic benefit cost [Abstract]
Service cost		0.2	0.2	0.3	0.3
Interest cost		2.4	2.4	4.9	4.8
Expected return on plan assets		(3.0)	(3.1)	(6.0)	(6.1)
Amortization of unrecognized net loss		1.4	1.4	2.8	2.8
Net periodic benefit cost		$ 1.0	$ 0.9	2.0	1.8
Pension [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions				$ 4.5	$ 3.3
[1] Represents net periodic benefit cost, exclusive of service cost, for the Company's pension and postretirement plans.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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