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Shareholders' Equity Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock Repurchased and Retired During Period, Shares	9,305				91,921
Stock Repurchased and Retired During Period, Value	$ 0.9				$ 8.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 192.0				$ 192.0
Dividends [Abstract]
Dividends declared per share	$ 0.10	$ 0.10	$ 0.10	$ 0.00	$ 0.30	$ 0.00
2016 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 250.0				$ 250.0
2014 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 200.0				$ 200.0

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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

+ References

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-Topic 210
-SubTopic 10
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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