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Stockholders' Equity - Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			35 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Shares repurchased in association with tax withholdings on the vesting of RSUs (in shares)	30,119	32,457	94,826
Class A common stock
Equity, Class of Treasury Stock [Line Items]
Shares repurchased pursuant to repurchase authorizations (in shares)	2,112,370	329,000	1,312,848	3,155,095
Total purchase price (in millions)	$ 179.0	$ 30.5	$ 104.4
Average purchase price per share (in dollars per share)	$ 84.72	$ 92.79	$ 79.50	$ 84.43

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- Definition

Represents the average purchase price per share for stocks repurchased and retired during the period.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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