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Equity, Stock Repurchase (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 24, 2017 | Jan. 31, 2018 | Jan. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
2017 Stock Repurchase Program |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |
Value of shares authorized to be repurchased | $ 1,000.0 |  |  |  |  |
Repurchase of stock program, period | 2 years |  |  |  |  |
Number of shares repurchased and retired |  |  |  | 8.4 |  |
Payments for shares repurchased and retired (in dollars) |  |  |  | $ 618.0 |  |
Number of shares repurchased |  | 1.1 |  |  |  |
Payments for shares repurchased (in dollars) |  | $ 105.5 |  |  |  |
Value of shares remaining that may be repurchased under the stock repurchase program |  | $ 276.5 |  |  |  |
2015 Stock Repurchase Program |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |
Number of shares authorized to be repurchased under the current open-market stock repurchase program |  |  | 10.0 |  |  |
Repurchase of stock program, period |  |  | 2 years |  |  |
Number of shares repurchased and retired |  |  |  |  | 5.5 | 4.5
Payments for shares repurchased and retired (in dollars) |  |  |  |  | $ 325.8 | $ 248.9

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + 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=84159872&loc=d3e21463-112644 Reference 2: 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 3: 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 4: 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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