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Equity - Share Repurchase Plan, Preferred Stock (Details) $ / shares in Units, $ in Millions | 12 Months Ended | 276 Months Ended
--- | --- | ---
Dec. 31, 2016 item $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2016 $ / shares shares
Share Repurchase Plan |  |  |  |
Stock Repurchase Program, Increase In Number Of Shares Authorized To Be Repurchased | 7,500,000 |  |  |
Repurchase of common shares (in shares) | 0 | 6,194,641 | 759,800 | 22,100,000
Average costs per share | $ / shares |  | $ 57.39 | $ 65.80 | $ 30.93
Value of shares repurchased | $ |  | $ 355.5 | $ 50.0 |
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares) | 8,428,592 |  |  | 8,428,592
Preferred Stock |  |  |  |
Preferred stock, authorized shares | 5,000,000 | 5,000,000 |  | 5,000,000
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  | $ 0.001
Preferred stock, issued shares | 0 | 0 |  | 0
Preferred stock, outstanding shares | 0 | 0 |  | 0
Minimum number of series in which preferred shares may be issued | item | 1 |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References No definition available. + Details
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- Definition The increase in number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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