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Equity - Share Repurchase Plan, Preferred Stock (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 23, 2018 shares | Oct. 20, 2015 shares | Dec. 31, 2018 USD ($) item $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 shares
Share Repurchase Plan |  |  |  |  |
Increase in authorized number of shares to be repurchased | 5,000,000 | 7,500,000 |  |  |
Repurchase of common shares (in shares) |  |  | 6,100,000 | 300,000 | 0
Average costs per share | $ / shares |  |  | $ 79.94 | $ 74.27 |
Value of shares repurchased | $ |  |  | $ 484.9 | $ 25.0 |
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares) |  |  | 7,000,000 |  |
Percent of outstanding stock authorized for repurchase |  |  | 11.00% |  |
Preferred Stock |  |  |  |  |
Preferred stock, authorized shares |  |  | 5,000,000 | 5,000,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 | $ 0.001 |
Preferred stock, issued shares |  |  | 0 | 0 |
Preferred stock, outstanding shares |  |  | 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 Represents the percent of outstanding stock authorized for repurchase. + 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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