Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Components of earnings (loss) from continuing operations before income taxes [Abstract]
United States			$ (8.6)	$ (15.4)	$ 31.1
Foreign			29.4	5.5	10.1
Earnings (loss) from continuing operations before income taxes			20.8	(9.9)	41.2
Federal [Abstract]
Current			0.1	0.1	0.4
Deferred			(3.8)	(13.0)	7.1
State [Abstract]
Current			0.3	0.2	0.0
Deferred			(0.2)	(2.5)	1.1
Foreign [Abstract]
Current			10.1	9.6	12.7
Deferred			(0.6)	(3.3)	(2.3)
Total income tax expense (benefit)			$ 5.9	$ (8.9)	$ 19.0
Reconciliation of federal statutory income tax rate to company's effective income tax rate [Abstract]
Statutory federal tax			35.00%	35.00%	35.00%
State taxes, net of federal benefit			(3.30%)	11.50%	2.40%
Taxes on non-U.S. earnings and losses			(3.50%)	26.40%	(4.90%)
Valuation allowance			1.20%	(20.90%)	8.30%
Tax credits			(9.00%)	20.50%	(6.10%)
Compensation			2.90%	(3.70%)	1.00%
Tax rate or law changes			(2.50%)	1.30%	1.20%
Uncertain tax positions, net of settlements			5.60%	(4.30%)	2.20%
Notional interest deductions			(8.80%)	0.00%	0.00%
Dividend repatriation			7.10%	16.00%	2.40%
Other			3.70%	8.10%	4.60%
Effective tax rate			28.40%	89.90%	46.10%
Deferred tax assets [Abstract]
Accounts receivable	$ 0.4	$ 0.1	$ 0.4	$ 0.1
Inventories	5.0	3.6	5.0	3.6
Plant and equipment	3.7	4.3	3.7	4.3
Pension and employee benefits	51.8	52.6	51.8	52.6
Net operating loss, capital loss and credit carryforwards	147.5	109.4	147.5	109.4
Other, principally accrued liabilities	10.9	7.5	10.9	7.5
Total gross deferred tax assets	219.3	177.5	219.3	177.5
Less: valuation allowances	(49.6)	(50.8)	(49.6)	(50.8)
Net deferred tax assets	169.7	126.7	169.7	126.7
Deferred tax liabilities [Abstract]
Plant and equipment	21.2	5.5	21.2	5.5
Goodwill	4.7	0.6	4.7	0.6
Intangible assets	43.3	1.5	43.3	1.5
Other	1.8	0.2	1.8	0.2
Total gross deferred tax liabilities	71.0	7.8	71.0	7.8
Net deferred tax asset	98.7	118.9	98.7	118.9
Valuation Allowance [Line Items]
Reversal of deferred tax asset valuation allowances	2.0	3.0		3.0
Reconciliation of unrecognized tax benefits [Roll Forward]
Balance, April 1			5.9	5.6
Gross increases - tax positions in prior period			0.3	0.0
Gross decreases - tax positions in prior period			(0.2)	(0.1)
Gross increases - due to acquisition			7.3	0.0
Gross increases - tax positions in current period			0.9	0.4
Balance, March 31	14.2	5.9	14.2	5.9	$ 5.6
Unrecognized tax benefits that would impact effective tax rate	11.9		11.9
Unrecognized tax benefits reductions in fiscal 2018			2.4
Unrecognized tax benefits reductions in fiscal 2018 that would impact effective tax rate			1.6
Unrecognized tax benefits accrued interest and penalties	0.8	$ 0.0	0.8	0.0
Undistributed foreign earnings [Abstract]
Tax on undistributed earnings of certain joint equity investment	0.3		0.3
Undistributed earnings in remaining foreign operations	505.0		505.0
Foreign Tax Jurisdictions [Member]
Valuation Allowance [Line Items]
Valuation allowance recorded against deferred tax assets			2.0	$ 5.0	$ 2.6
Other Tax Jurisdictions [Member]
Valuation Allowance [Line Items]
Recorded net reduction of deferred tax asset valuation allowances			1.8
Federal and State [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, research and development	27.4		$ 27.4
Federal and State [Member] | Minimum [Member]
Tax Credit Carryforward [Line Items]
Tax loss credit carryforward, expiration date			Mar. 31, 2018
Federal and State [Member] | Maximum [Member]
Tax Credit Carryforward [Line Items]
Tax loss credit carryforward, expiration date			Mar. 31, 2037
Foreign Tax Jurisdictions [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	485.0		$ 485.0
Tax losses subject to expiration	167.0		167.0
Tax losses not subject to expiration	318.0		$ 318.0
Foreign Tax Jurisdictions [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, expiration date			Mar. 31, 2018
Foreign Tax Jurisdictions [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, expiration date			Mar. 31, 2037
State and Local [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 212.7		$ 212.7
State and Local [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, expiration date			Mar. 31, 2018
State and Local [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, expiration date			Mar. 31, 2037
Germany [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions			Fiscal 2011 - Fiscal 2016
Italy [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions			Calendar 2011 - Fiscal 2016
United States [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions			Fiscal 2014 - Fiscal 2016