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Additional Financial Information (Non-cash Investing and Financing Activities) (Details) - USD ($) $ in Millions | 6 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Additional Financial Information [Abstract] |  |
Issuance of common shares related to business acquisitions | $ 83.7 | $ 0.0
Accrued dividends | $ 19.4 | $ 0.0

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