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Segment Information (Narrative) (Details) $ in Millions			3 Months Ended								12 Months Ended
	Mar. 31, 2017 USD ($) customer	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2017 USD ($) customer	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($) customer
Revenue and Accounts Receivable, Major Customers [Line Items]
Capital expenditures											$ (25.2)	$ (18.4)	$ (17.0)
Revenues			$ 1,256.1	$ 752.3	$ 639.5	$ 553.6	$ 791.2	$ 670.5	$ 476.8	$ 408.9	$ 3,201.5	2,347.4	$ 2,399.6
Customer Concentration Risk | Sales Revenue, Net
Revenue and Accounts Receivable, Major Customers [Line Items]
Revenues												290.4
Number of customers over 10% threshold | customer											0		0
Customer 1 Concentration Risk | Accounts Receivable
Revenue and Accounts Receivable, Major Customers [Line Items]
Number of customers over 10% threshold | customer	1
Percentage of consolidated gross accounts receivable attributable to customer over threshold	30.00%	32.00%
Accounts receivable, gross	$ 390.9	$ 272.5	$ 390.9				$ 272.5				$ 390.9	$ 272.5
Media Networks
Revenue and Accounts Receivable, Major Customers [Line Items]
Capital expenditures											10.6
Television Production
Revenue and Accounts Receivable, Major Customers [Line Items]
Capital expenditures											1.8
Corporate
Revenue and Accounts Receivable, Major Customers [Line Items]
Capital expenditures											$ 12.8

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