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Share Repurchase Programs (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2015
December 2015 Program |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Common stock repurchases | $ 65.9 | $ 25.7 |
Common Stock | December 2015 Program |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Repurchased and retired shares (in shares) | 933,000 | 380,000 |
December 2015 Program |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Maximum number of share repurchases authorization (no more than 1.5 million) (in shares) |  |  | 1,500,000.0
Number of shares authorized to be repurchased (in shares) |  |  | 2,000,000
December 2015 Program | December Two Thousand Thirteen Anti Dilutive Share Repurchase Program |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Number of shares authorized to be repurchased (in shares) |  |  | 500,000.0

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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=84159872&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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