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Additional Financial Information (Non-Cash Investing and Financing Activities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Non-cash investing activities |  |  |
Issuance of common shares related to business acquisitions | $ 0.0 | $ 83.7 | $ 0.0
Non-cash financing activities |  |  |
Accrued dividends | $ 0.0 | $ 0.0 | $ 19.1

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