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Incentive Compensation Plans Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock-based Payment Award |  |  |
Intrinsic value of stock options exercised | $ 15.2 | $ 16.1 | $ 10.7
Proceeds from Stock Options Exercised including Taxes Withheld | $ 18.2 | $ 20.4 | $ 25.2
Employee Stock Option |  |  |
Stock-based Payment Award |  |  |
Stock options outstanding as of January 1, 2016 | 6.0 |  |
Stock options outstanding as of Jan 1, 2016, Weighted-average exercise price | $ 9.63 |  |
Exercised | (1.2) | (1.4) | (1.7)
Exercised, Weighted-average exercise price | $ 9.62 |  |
Stock options outstanding as of December 31, 2016 | 4.8 | 6.0 |
Stock options outstanding as of Dec 31, 2016, Weighted-average exercise price | $ 9.83 | $ 9.63 |
Options outstanding, Weighted Average Remaining Contractual Term | 3 years 1 month |  |
Stock options outstanding, Aggregate intrinsic value | $ 61.0 |  |

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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