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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Deferred tax assets:    
Intangible assets $ 1,209.8 $ 0.0
Asbestos liability 349.3 382.9
Other provisions and accruals 55.6 37.7
Net operating loss carryforwards 69.9 25.5
Foreign and research tax credit carryforwards 115.5 126.1
Total deferred tax assets 1,800.1 572.2
Valuation allowance (267.6) (129.6)
Total deferred tax assets net of valuation allowance 1,532.5 442.6
Deferred tax liabilities:    
Depreciable and amortizable assets (132.2) (81.6)
Other (38.5) (14.6)
Total deferred tax liabilities (170.7) (96.2)
Total deferred taxes, net $ 1,361.8 $ 346.4