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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock option activity [Text Block] |
| Shares (thousands) |  | Weighted average exercise price |  | Weighted average remaining contractual life (in years) |  | Aggregate intrinsic value (in millions)
Outstanding at January 1, 2014 | 1,997 |  |  | $ | 15.82 |  |  | 2.6 |  | $ | 80.0 |
Exercised | (283 | ) |  | $ | 14.04 |  |  |  |  | $ | 13.8 |
Outstanding at December 31, 2014 | 1,714 |  |  | $ | 16.11 |  |  | 1.7 |  | $ | 66.5 |
Exercised | (440 | ) |  | $ | 14.76 |  |  |  |  | $ | 19.2 |
Forfeited | (7 | ) |  | $ | 14.52 |  |  |  |  |
Outstanding at December 31, 2015 | 1,267 |  |  | $ | 16.59 |  |  | 0.9 |  | $ | 33.7 |
Exercised | (794 | ) |  | $ | 16.07 |  |  |  |  | $ | 14.4 |
Outstanding at December 31, 2016 | 473 |  |  | $ | 17.47 |  |  | 0.1 |  | $ | 10.4 |
Options exercisable at December 31, 2016 | 473 |  |  | $ | 17.47 |  |  | 0.1 |  | $ | 10.4 |
Proceeds from stock option exercises [Text Block] |
| Year Ended December 31,
(millions of dollars) | 2016 |  | 2015 |  | 2014
Proceeds from stock options exercised — gross | $ | 12.7 |  |  | $ | 6.5 |  |  | $ | 4.0 |
Tax benefit | 0.3 |  |  | 10.3 |  |  | 12.9 |
Proceeds from stock options exercised, net of tax | $ | 13.0 |  |  | $ | 16.8 |  |  | $ | 16.9 |
Restricted stock compensation expense [Text Block] |
| Year Ended December 31,
(millions of dollars, except per share data) | 2016 |  | 2015 |  | 2014
Restricted stock compensation expense | $ | 26.7 |  |  | $ | 28.0 |  |  | $ | 20.7 |
Restricted stock compensation expense, net of tax | $ | 19.5 |  |  | $ | 20.4 |  |  | $ | 15.1 |
Status of nonvested restricted stock [Text Block] |
| Shares subject to restriction (thousands) |  | Weighted average price
Nonvested at January 1, 2014 | 1,411 |  |  | $ | 37.86 |
Granted | 447 |  |  | $ | 54.36 |
Vested | (530 | ) |  | $ | 37.42 |
Forfeited | (62 | ) |  | $ | 41.14 |
Nonvested at December 31, 2014 | 1,266 |  |  | $ | 43.57 |
Granted | 687 |  |  | $ | 58.45 |
Vested | (588 | ) |  | $ | 39.14 |
Forfeited | (39 | ) |  | $ | 50.85 |
Nonvested at December 31, 2015 | 1,326 |  |  | $ | 53.18 |
Granted | 724 |  |  | $ | 30.07 |
Vested | (551 | ) |  | $ | 47.55 |
Forfeited | (70 | ) |  | $ | 43.05 |
Nonvested at December 31, 2016 | 1,429 |  |  | $ | 44.12 |
Amounts expensed under plan and share issuances [Text Block] |
| Year Ended December 31,
(millions of dollars, except share data) | 2016 |  | 2015 |  | 2014
Expense | $ | 9.6 |  |  | $ | 12.2 |  |  | $ | 11.4 |
Number of shares | — |  |  | — |  |  | — |

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- Definition Tabular disclosure of the amount of cash proceeds received from the exercise of stock options and similar instruments granted under share-based payment arrangements and the tax benefit realized from stock options exercised during the period. Disclosure may also include the intrinsic value of stock options exercised during the period. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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