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Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2015
Stock Repurchase Period
Repurchased shares			439,383
Repurchase of common stock			$ 22.0
Acquired Employee Equity Awards
Stock Repurchase Period
Repurchased shares	156,383
Repurchase of common stock	$ 8.0
Repurchased shares, average price (in dollars per share)	$ 51.05
Share Repurchase Program
Stock Repurchase Period
Repurchased shares		283,000
Repurchase of common stock		$ 14.0
Repurchased shares, average price (in dollars per share)		$ 49.25
Amount authorized to be repurchased	$ 136.0		$ 136.0

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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-Name Regulation S-X (SX)



-Number 210



-Section 04



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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



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

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-Topic 505



-SubTopic 30



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