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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Deferred tax assets:    
Asbestos liability $ 382.9 $ 356.6
Other provisions and accruals 37.7 52.8
Net operating loss carryforwards 25.5 24.2
Foreign tax credit carryforwards 126.1 107.5
Total deferred tax assets 572.2 541.1
Valuation allowance (129.6) (110.4)
Total deferred tax assets net of valuation allowance 442.6 430.7
Deferred tax liabilities:    
Depreciable and amortizable assets (81.6) (130.0)
Other (14.6) (12.0)
Total deferred tax liabilities (96.2) (142.0)
Total deferred taxes, net $ 346.4 $ 288.7