General (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2016
Income Tax Examination [Line Items]
Provision (benefit) for income taxes		$ 35.2	$ (0.7)	$ 37.4	$ 1.3
New Accounting Guidance [Abstract]
Net periodic benefit cost	[1]	0.6	0.7	2.2	2.2
United States Tax Reform [Member]
Income Tax Examination [Line Items]
Provision (benefit) for income taxes		35.7
Luvata HTS [Member]
Business Acquisition [Line Items]
Acquired ownership interest by the entity						100.00%
ASU 2017-07 [Member] | Other Income and Expense [Member]
New Accounting Guidance [Abstract]
Net periodic benefit cost		$ 0.6	0.7	2.2	2.2
ASU 2017-07 [Member] | Cost of Sales [Member]
New Accounting Guidance [Abstract]
Net periodic benefit cost			(0.3)		(0.9)
ASU 2017-07 [Member] | SG&A [Member]
New Accounting Guidance [Abstract]
Net periodic benefit cost			$ (0.4)		$ (1.3)
ASU 2016-09 [Member]
New Accounting Guidance [Abstract]
Cumulative increase to deferred tax assets				0.4
Cumulative increase to equity				$ 0.4

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