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Equity - Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity [Abstract]
Shares repurchased and retired during period (in shares)	2.3	0.8
Common stock value repurchased including acquisition costs	$ 19.2	$ 8.3
Average cost per share of repurchased shares (in dollars per share)	$ 8.46	$ 10.22
Stock repurchase program remaining authorized amount	$ 22.6

X

- Definition

Common Stock Acquired, Average Cost Per Share

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X

- Definition

Common Stock Value Acquired Including Acquisition Costs

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- Definition

Amount remaining of a stock repurchase plan authorized.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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