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Segment Information (Narrative) (Details) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2018 USD ($) customer | Mar. 31, 2017 USD ($) customer | Mar. 31, 2016 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | $ 45.9 | $ 25.2 | $ 18.4
Revenues |  |  | $ 1,040.2 | $ 1,142.7 | $ 940.8 | $ 1,005.3 | $ 1,256.1 | $ 752.3 | $ 639.5 | $ 553.6 | 4,129.1 | $ 3,201.5 | 2,347.4
Customer Concentration Risk | Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 413.2 |  | $ 290.4
Number of customers over 10% threshold | customer |  |  |  |  |  |  |  |  |  |  | 1 | 0 |
Customer Concentration Risk | Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers over 10% threshold | customer |  |  |  |  |  |  |  |  |  |  | 1 |  |
Percentage of consolidated gross accounts receivable attributable to customer over threshold | 32.00% | 30.00% |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, gross | $ 419.2 | $ 390.9 | $ 419.2 |  |  |  | $ 390.9 |  |  |  | $ 419.2 | $ 390.9 |
Media Networks |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 31.5 | 10.6 |
Television Production |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 1.4 | 1.8 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | $ 13.0 | $ 12.8 |

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