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Equity - Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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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 |

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- Definition Common Stock Acquired, Average Cost Per Share + References No definition available. + Details
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- Definition Common Stock Value Acquired Including Acquisition Costs + References No definition available. + Details
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Balance Type: | debit
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- References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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