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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Reconciliation of unrecognized tax benefits [Roll Forward] |  |  |  |
Beginning balance |  | $ 13.6 | $ 14.2 |
Gross increases - tax positions in prior period |  | 1.6 | 0.8 |
Gross decreases - tax positions in prior period |  | (0.2) | (1.2) | [1]
Gross increases - due to acquisition |  | 0.0 | 1.4 |
Gross increases - tax positions in current period |  | 1.1 | 0.5 |
Settlements |  | (0.1) | (0.3) |
Lapse of statute of limitations |  | (2.2) | (1.8) |
Ending balance |  | 13.8 | 13.6 |
Unrecognized tax benefits that would impact effective tax rate |  | 12.2 |  |
Unrecognized tax benefits accrued interest and penalties |  | $ 1.1 | 1.0 |
Change in income tax expense (benefit) due to the reduction of federal corporate tax |  |  | $ 1.0 |
Forecast [Member] |  |  |  |
Reconciliation of unrecognized tax benefits [Roll Forward] |  |  |  |
Lapse of statute of limitations | $ (0.2) |  |  |
[1] | Fiscal 2018 includes $1.0 million related to the reduction of the U.S. federal corporate tax rate as a result of the Tax Act.

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