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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Mar. 31, 2016
Deferred tax assets:    
Asbestos liability $ 356.6 $ 384.9
Other provisions and accruals 52.8 49.0
Net operating loss carryforwards 24.2 24.2
Foreign tax credit carryforwards 107.5 112.4
Total deferred tax assets 541.1 570.5
Valuation allowance (110.4) (115.0)
Total deferred tax assets net of valuation allowance 430.7 455.5
Deferred tax liabilities:    
Depreciable and amortizable assets (130.0) (117.4)
Other (12.0) (9.4)
Total deferred tax liabilities (142.0) (126.8)
Total deferred taxes, net $ 288.7 $ 328.7