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Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Jan. 21, 2015
Share repurchase program
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				20,000,000.0
UpfrontPaymentUnderAcceleratedStockRepurchaseProgram		$ 50.0
Stock Repurchased and Retired During Period, Shares	(700,000)	(3,100,000)
Stock Repurchased and Retired During Period, Value		$ 40.0
UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock		$ 10.0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	3,600,000		3,600,000
Retained Earnings [Member]
Share repurchase program
Stock Repurchased and Retired During Period, Value			$ 37.5

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- Definition

-- None. No documentation exists for this element. --

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- Definition

The excess of the amount paid under the accelerated stock repurchase agreement at inception relative to the fair value of the initial delivery of shares, evaluated as an unsettled forward contract indexed to the issuer's stock and reduced from Stockholders' Equity.

+ References

No definition available.

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- Definition

The upfront payment in exchange for initial delivery of shares under the accelerated stock repurchase program.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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-Topic 505
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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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