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Equity - Reincorporation, Common Stock, Share Repurchase Plan and Preferred Stock (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended | 264 Months Ended
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Feb. 28, 2015 $ / shares | Feb. 28, 2014 $ / shares | Jul. 31, 2013 $ / shares | Feb. 28, 2013 $ / shares | Dec. 31, 2015 USD ($) item $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 $ / shares | Dec. 31, 2015 item $ / shares shares
Common Stock |  |  |  |  |  |  |  |
Number of common stock shares authorized | shares |  |  |  |  | 200,000,000 | 200,000,000 |  | 200,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001
Votes per share of common stock | item |  |  |  |  | 1 |  |  | 1
Common stock quarterly dividend per share (in dollars per share) | $ / shares | $ 0.40 | $ 0.35 | $ 0.33 | $ 0.30 |  | $ 1.40 | $ 1.26 |
Common stock quarterly dividend per share, before increase (in dollars per share) | $ / shares |  |  |  | $ 0.25 |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |
Stock Repurchase Program, Increase In Number Of Shares Authorized To Be Repurchased | shares |  |  |  |  | 7,500,000 |  |  |
Repurchase of common shares (in shares) | shares |  |  |  |  | 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) | shares |  |  |  |  | 8,428,592 |  |  | 8,428,592
Preferred Stock |  |  |  |  |  |  |  |
Preferred stock, authorized shares | 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
Minimum number of series in which preferred shares may be issued | item |  |  |  |  | 1 |  |  |

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- Definition The number of votes per share of common stock on all matters except the election of members to the Board of Directors. + References No definition available. + Details
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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 Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Face amount or stated value per share of common stock. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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