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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-based Payment Award |  |  |
Intrinsic value of stock options exercised | $ 9.1 | $ 27.9 | $ 15.1
Proceeds from stock options exercised including taxes withheld | 8.3 | 29.0 | 20.0
Tax withheld on stock options received | $ 4.0 | $ 13.3 | $ 6.8
Employee Stock Option |  |  |
Stock-based Payment Award |  |  |
Stock options outstanding as of January 1, 2018 | 1.8 |  |
Stock options outstanding as of Jan 1, 2018, Weighted-average exercise price | $ 10.66 |  |
Exercised | (0.6) | (1.9) | (1.1)
Exercised, weighted-average exercise price | $ 7.38 |  |
Stock options outstanding as of December 31, 2018 | 1.2 | 1.8 |
Stock options outstanding as of Dec 31, 2018, Weighted-average exercise price | $ 12.26 | $ 10.66 |
Options outstanding, weighted average remaining contractual term | 2 years 8 months 12 days |  |
Stock options outstanding, aggregate intrinsic value | $ 12.9 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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