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Additional Financial Information (Non-Cash Investing and Financing Activities) (Details) - USD ($) $ in Millions	12 Months Ended
	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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Non-cash Investing Activities [Abstract]

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Value of stock issued pursuant to acquisitions during the period.

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