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Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Deferred tax assets [Abstract] |  |
Accounts receivable | $ 0.3 | $ 0.4
Inventories | 4.1 | 5.0
Plant and equipment | 2.3 | 3.7
Pension and employee benefits | 36.0 | 51.8
Net operating loss, capital loss and credit carryforwards | 139.2 | 147.5
Other, principally accrued liabilities | 9.9 | 10.9
Total gross deferred tax assets | 191.8 | 219.3
Less: valuation allowances | (48.9) | (49.6)
Net deferred tax assets | 142.9 | 169.7
Deferred tax liabilities [Abstract] |  |
Plant and equipment | 17.6 | 21.2
Goodwill | 5.2 | 4.7
Intangible assets | 32.4 | 43.3
Other | 0.7 | 1.8
Total gross deferred tax liabilities | 55.9 | 71.0
Net deferred tax asset | $ 87.0 | $ 98.7

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