Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Deferred tax assets:
Compensation and retirement benefits	$ 63.5	$ 55.7
General accruals and reserves	8.7	9.8
Lease liabilities	27.7	0.0
State tax net operating loss and credit carryforwards	22.5	21.9
Federal and state capital loss carryforwards	18.2	12.7
Foreign net operating loss and interest carryforwards	5.2	6.7
Other	0.0	0.3
Total deferred tax assets before valuation allowance	145.8	107.1
Valuation allowance	(39.4)	(32.4)
Total deferred tax assets	106.4	74.7
Deferred tax liabilities:
Property, plant and equipment	33.8	32.6
Lease ROU assets	26.2	0.0
Inventories	21.6	15.4
Intangible assets and goodwill	131.2	137.9
Other	1.0	0.0
Total deferred tax liabilities	213.8	185.9
Net deferred tax liabilities	107.4	111.2
Net amount on Consolidated Balance Sheets consists of:
Other assets	13.6	14.7
Deferred income taxes	(121.0)	(125.9)
Net long-term deferred tax liabilities	$ (107.4)	$ (111.2)