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Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock Repurchase Period |  |  |
Repurchase of common stock | $ 48.9 | $ 15.5 | $ 15.8
Acquired Employee Equity Awards |  |  |
Stock Repurchase Period |  |  |
Repurchased shares | 156,383 | 160,350 | 97,818
Repurchase of common stock | $ 8.0 | $ 7.5 | $ 3.1
Repurchased shares, average price (in dollars per share) | $ 51.05 | $ 46.48 | $ 32.13
Share Repurchase Program |  |  |
Stock Repurchase Period |  |  |
Repurchased shares | 854,313 | 175,000 | 410,000
Repurchase of common stock | $ 40.9 | $ 8.0 | $ 12.7
Repurchased shares, average price (in dollars per share) | $ 47.86 | $ 45.95 | $ 30.93
Amount authorized to be repurchased | $ 200.0 |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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