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Acquisitions (Narrative) (Details) - USD ($) $ in Millions			9 Months Ended
	May 29, 2018	Oct. 11, 2017	Dec. 31, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Period for weighted average closing price (number of consecutive trading days)	20 days
Goodwill			$ 2,833.5	$ 2,740.8
Deferred compensation arrangements			$ 38.3
Redeemable noncontrolling interest	$ (15.8)
Business combination, contingent consideration, contingency period			5 years
3 Arts Entertainment
Business Acquisition [Line Items]
Business acquisition, percentage of membership interest acquired	51.00%
Purchase price	$ 166.6
Percent of purchase price paid in cash at closing	50.00%
Acquisition related costs	$ 1.3
Goodwill	92.7
Finite-lived intangible assets	$ 47.0
Period for issuance of equity interests after closing date	1 year
Good Universe
Business Acquisition [Line Items]
Goodwill		$ 29.0
Purchase price, cash consideration		20.4
Purchase price, cash consideration to be paid after one-year of the closing date		$ 1.4
Period for issuance of equity interests after closing date		1 year
Purchase price, loans assumed		$ 23.6
Repayments of corporate debt and production loans			$ 14.9
Class B Non-Voting Shares | 3 Arts Entertainment
Business Acquisition [Line Items]
Percent of purchase price paid in Class B non-voting common shares at closing	32.50%
Percent of purchase prince to be paid in Class B non-voting common shares on the one-year anniversary of closing	17.50%
Class B Non-Voting Shares | Good Universe
Business Acquisition [Line Items]
Purchase price, common shares to be issued, number of shares		119,751
Customer relationships | 3 Arts Entertainment
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			12 years
3 Arts Entertainment
Business Acquisition [Line Items]
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders	49.00%

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