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Stockholders' Equity (Details) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) vote $ / shares shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) shares | Feb. 08, 2017 shares
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Common stock shares authorized (in shares) | 300,000,000.0 |  |  |
Common stock par value (USD per share) | $ / shares | $ 0.01 |  |  |
Preferred stock authorized shares (in shares) | 10,000.00 |  |  |
Preferred stock par or stated value (in dollars per share) | $ / shares | $ 0.01 |  |  |
Common stock, number of votes granted per common share held | vote | 1 |  |  |
Treasury stock, shares, acquired (in shares) | 0 |  | 600,000 |
Value of treasury stock acquired | $ |  |  | $ 40.1 |
Series A Preferred Stock |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Number of shares called by each right |  |  |  | 0.001
Performance-based Restricted Stock Units |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Value of treasury stock acquired | $ | $ 3.0 | $ 0.3 |  |
Repurchase of shares upon vesting of PRSUs withheld to satisfy tax withholding obligations (in shares) | 100,000 |  |  |
February 2016 Program |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Remaining shares under share repurchase authorization (in shares) | 226,900,000 |  |  |

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