Deferred Carriage Fees Contractual Period

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- Definition

Number of Customers

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No definition available.

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- Definition

Class A stockholders are entitled to elect a percentage of the Board of Directors.

+ References

No definition available.

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- Definition

Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
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- Definition

Describe the conversion features of common stock if such stock is convertible. That is, shares of common stock into which another convertible security was converted, or shares of common stock into which another class of common stock was converted.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
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- Definition

Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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-Paragraph 3
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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-Name Accounting Standards Codification
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- Definition

Percentage of vesting of share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

Amount of stock repurchase plan authorized.

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No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

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No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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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%