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Stockholders' Equity Share repurchase and retirement (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Jun. 13, 2016
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 19.0	$ 22.6
Stock Repurchase Program, Authorized Amount			$ 150.0
Stock Repurchased During Period, Shares	510,411	607,911
Additional Paid-in Capital [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 5.4	$ 6.4
Retained Earnings [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 13.6	$ 16.2

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Amount of stock repurchase plan authorized.

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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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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