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Common Stock Repurchase Program Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Oct. 31, 2016 | Oct. 31, 2016
Common Stock |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Repurchased shares of its common stock on the open market, value |  | $ 39.9 | $ 151.4
Retained Earnings |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Repurchased shares of its common stock on the open market, value |  | $ 99.7 | $ 258.2
Common Stock Repurchase Program |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Common stock repurchased and retired (in shares) |  | 2.0 | 6.8
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share) |  | $ 68.74 | $ 59.92
Common Stock shares remained available for repurchase under repurchase plans (in shares) |  | 29.5 | 29.5
Stock Repurchase Program, Shares Authorized During Period | 30.0 |  |

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- Definition Number of shares that have been repurchased and retired during the period. + 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 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 Reference 3: 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 4: 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 + Details
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