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Business and Basis of Presentation (Income Taxes) (Details)
$ in Millions
12 Months Ended
Mar. 31, 2018
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Net gain related to deferred tax liability $ 267.0
Net gain related to the lower blended tax rate 3.2
Net gain 270.2
Repatriation charge $ 1.9