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Significant Accounting Policies - Income Taxes (Details)
$ in Millions
12 Months Ended
Mar. 31, 2020
USD ($)
Income Tax Disclosure [Abstract]  
Minimum percentage of qualifying income of non-taxable subsidiaries 90.00%
Deferred tax liability $ 56.4
Deferred tax benefit $ 2.9
Effective tax rate 27.80%