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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Jun. 06, 2017 USD ($) | Mar. 07, 2016 USD ($)
Advertising Expense | $ 200.4 | $ 222.1 | $ 210.9 |  |
Foreign Currency Transaction Gain (Loss), before Tax | 15.0 | 39.0 | $ 22.0 |  |
Accounts Receivable, Net, Noncurrent | $ 150.2 | $ 114.3 |  |  |
Stockholders entitled election of Board of Directors | 25.00% |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 1,000.0 |  |  | $ 500.0 | $ 500.0
Treasury Stock Acquired, Average Cost Per Share | $ / shares | $ 55.74 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 342.6 |  |  |  |
Common Class A [Member] |  |  |  |  |
Common Stock, Voting Rights | 1 |  |  |  |
Common Stock, Conversion Basis | 1 |  |  |  |
Share repurchases | shares | (7,800) | (4,120) |  |  |
Common Class B [Member] |  |  |  |  |
Common Stock, Voting Rights | 10 |  |  |  |
Common Stock, Conversion Basis | 1 |  |  |  |
Share repurchases | shares | 0 | 0 |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |
Number of Customers | 1 |  |  |  |
Concentration Risk, Percentage | 20.00% | 19.00% |  |  |
Maximum [Member] |  |  |  |  |
Deferred Carriage Fees Contractual Period | 13 years |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2011 Non-Employee Director Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 100.00% |  |  |  |

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