Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets:
Compensation and retirement benefits	$ 55.7	$ 47.0
General accruals and reserves	9.8	7.1
State tax net operating loss carryforwards	21.9	23.1
Federal and state capital loss carryforwards	12.7	0.0
Foreign net operating loss and interest carryforwards	6.7	9.2
Other	0.3	3.1
Total deferred tax assets before valuation allowance	107.1	89.5
Valuation allowance	(32.4)	(23.0)
Total deferred tax assets	74.7	66.5
Deferred tax liabilities:
Property, plant and equipment	32.6	33.1
Inventories	15.4	19.7
Intangible assets and goodwill	137.9	142.5
Cancellation of indebtedness	0.0	7.1
Total deferred tax liabilities	185.9	202.4
Net deferred tax liabilities	111.2	135.9
Net amount on Consolidated Balance Sheet consists of:
Other assets	14.7	13.4
Deferred income taxes	(125.9)	(149.3)
Net long-term deferred tax liabilities	$ (111.2)	$ (135.9)