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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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