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Shareholders' Equity - Dividends and Stock Repurchase Programs (Details) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 31, 2017
Dividends
Cash dividends declared (in dollars per share)	$ 0.24	$ 0.24	$ 0.24
Stock Repurchase Programs
Authorized common stock repurchase amount					$ 100,000,000.0
Shares repurchased (in shares)		1.7	1.0	1.6
Amount of shares repurchased	$ 20,000,000.0	$ 61,900,000	$ 41,200,000	$ 70,500,000
Amount available to repurchase shares under stock repurchase program	$ 80,000,000.0

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

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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 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.

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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.

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