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Additional Financial Information (Non-Cash Investing and Financing Activities) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Non-cash investing activities
Issuance of common shares related to business acquisitions	$ 83.7	$ 0.0	$ 1,327.7
Accrued purchase consideration for dissenting shareholders	0.0	0.0	797.3
Non-cash financing activities
Accrued dividends	0.0	19.1	0.0
Starz
Non-cash investing activities
Issuance of Starz share-based payment replacement awards	0.0	0.0	186.5
Conversion of Convertible Senior Subordinated Notes | Convertible Senior Subordinated Notes
Non-cash financing activities
Conversions of convertible senior subordinated notes	$ 0.0	$ 0.0	$ 41.9

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