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Number of Customers

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

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent.

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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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Description of basis for conversion of convertible common stock.

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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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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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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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Percentage of vesting of award under share-based payment arrangement.

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Amount of stock repurchase plan authorized.

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No definition available.

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Amount remaining of a stock repurchase plan authorized.

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No definition available.

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

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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	12 Months Ended
	Dec. 31, 2019 USD ($) customer $ / shares shares	Dec. 31, 2018 USD ($) customer shares	Dec. 31, 2017 USD ($) shares	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 170,056,000
Lease liabilities	223,736,000
Advertising costs	180,300,000	$ 196,000,000.0	$ 200,400,000
Foreign currency transaction gains (losses)	11,100,000	(6,800,000)	$ 15,000,000.0
Accounts receivable contractually due in excess of one-year	273,000,000.0	$ 182,100,000
Repurchase amount (up to)	$ 1,500,000,000
Average purchase (in dollars per share) \| $ / shares	$ 54.24
Available for repurchase under program	$ 488,800,000
ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets				$ 180,000,000.0
Historical deferred rent liability				57,000,000.0
Lease liabilities				$ 237,000,000.0
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of customers \| customer	2	2
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer One [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage	16.00%	13.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Two [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage	10.00%	12.00%
Common Class A [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock, voting rights	one
Common stock, conversion basis	one
Stockholders entitled election of Board of Directors	25.00%
Share repurchases \| shares	1,302	5,386	7,790
Common Class B [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock, voting rights	ten
Common stock, conversion basis	one
Share repurchases \| shares	0	0	0
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Period of related affiliation arrangement (up to)	10 years
2011 Non-Employee Director Plan [Member] \| Restricted Stock Units (RSUs) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vesting percentage	100.00%