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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Mar. 31, 2015
Deferred tax assets:    
Asbestos liability $ 384.9 $ 405.2
Other provisions and accruals 49.0 46.3
Net operating loss carryforwards 24.2 17.0
Foreign tax credit carryforwards 112.4 107.0
Total deferred tax assets 570.5 575.5
Valuation allowance (115.0) (113.0)
Total deferred tax assets, net of valuation allowance 455.5 462.5
Deferred tax liabilities:    
Depreciable and amortizable assets (117.4) (112.3)
Other (9.4) (3.7)
Total deferred tax liabilities (126.8) (116.0)
Net deferred tax assets $ 328.7 $ 346.5