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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2015 | 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 |
Exercised | (473 | ) |  | $ | 17.47 |  |  |  |  | $ | 10.4 |
Outstanding at December 31, 2017 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |
Options exercisable at December 31, 2017 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |
Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block] |
| Year Ended December 31,
(millions of dollars) | 2017 |  | 2016 |  | 2015
Proceeds from stock options exercised — gross | $ | 8.3 |  |  | $ | 12.7 |  |  | $ | 6.5 |
Tax benefit | 8.2 |  |  | 0.3 |  |  | 10.3 |
Proceeds from stock options exercised, net of tax | $ | 16.5 |  |  | $ | 13.0 |  |  | $ | 16.8 |
Restricted stock compensation expense [Text Block] |
| Year Ended December 31,
(millions of dollars, except per share data) | 2017 |  | 2016 |  | 2015
Restricted stock compensation expense | $ | 27.0 |  |  | $ | 26.7 |  |  | $ | 28.0 |
Restricted stock compensation expense, net of tax | $ | 19.7 |  |  | $ | 19.5 |  |  | $ | 20.4 |
Status of nonvested restricted stock [Text Block] |
| Shares subject to restriction (thousands) |  | Weighted average grant date fair value
Nonvested at January 1, 2015 | 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 |
Granted | 804 |  |  | $ | 40.10 |
Vested | (521 | ) |  | $ | 56.53 |
Forfeited | (119 | ) |  | $ | 38.97 |
Nonvested at December 31, 2017 | 1,593 |  |  | $ | 38.86 |
Share-based Compensation, Performance Shares Award Nonvested Activity [Table Text Block] |
| Year Ended December 31,
(millions of dollars, except share data) | 2017 |  | 2016 |  | 2015
Expense | $ | 9.9 |  |  | $ | 9.6 |  |  | $ | 12.2 |
Number of shares | — |  |  | — |  |  | — |
| Year Ended December 31,
(millions of dollars, except share data) | 2017 |  | 2016
Expense | $ | 15.9 |  |  | $ | 7.1 |
Number of shares | 126,000 |  |  | — |
A summary of the status of the Company’s nonvested relative revenue growth performance shares at December 31, 2017 and 2016 is as follows:
| Number of shares (thousands) |  | Weighted average grant date fair value
Nonvested at December 31, 2015 | — |  |  | $ | — |
Granted | 485 |  |  | $ | 38.62 |
Vested | (126 | ) |  | $ | 38.62 |
Forfeited | (39 | ) |  | $ | 38.62 |
Nonvested at December 31, 2016 | 320 |  |  | $ | 38.62 |
Granted | 198 |  |  | $ | 40.08 |
Vested | (156 | ) |  | $ | 38.62 |
Forfeited | (7 | ) |  | $ | 39.20 |
Nonvested at December 31, 2017 | 355 |  |  | $ | 39.42 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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