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Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Table of Performance Share Unit Monte Carlo Assumptions [Table Text Block] |
| 2017 |  | 2016
Risk-free interest rate | 1.73 | % |  | 0.98 | %
Expected life in years | 3.0 |  |  | 3.0 |
Expected volatility | 28 | % |  | 29 | %
Expected dividend yield | — |  |  | — |
Schedule of Stock Options, Activity |
| Number of Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016 | 1,215,481 |  |  | $192.63 |  | $274.6
Granted | 46,877 |  |  | 671.60 |  |
Exercised | (245,562 | ) |  | 116.67 |  |
Forfeited | (8,320 | ) |  | 241.83 |  |
Outstanding at December 31, 2017 | 1,008,476 |  |  | $232.99 |  | $392.2
Options exercisable at December 31, 2017 | 755,407 |  |  | $180.66 |  | $331.5
Schedule Shares Outstanding under Stock Option Plans, by Exercise Price Range |
Number of Options Outstanding |  | Weighted Average Exercise Price |  | Remaining Contractual Life of Options Outstanding |  | Options Exercisable
102,357 |  |  | $ | 89.23 |  |  | 1.7 |  | 102,357 |
124,585 |  |  | $ | 133.00 |  |  | 2.8 |  | 124,585 |
298,180 |  |  | $ | 159.96 |  |  | 4.4 |  | 298,180 |
125,523 |  |  | $ | 244.99 |  |  | 5.9 |  | 100,716 |
357,831 |  |  | $ | 365.57 |  |  | 8.0 |  | 129,569 |
1,008,476 |  |  |  |  |  | 5.4 |  | 755,407 |
Schedule of Stock Options, Valuation Assumptions |
| 2017 |  | 2016 |  | 2015
Risk-free interest rate | 2.00 | % |  | 1.26 | % |  | 1.65 | %
Expected life in years | 5.8 |  |  | 5.7 |  |  | 5.7 |
Expected volatility | 28 | % |  | 29 | % |  | 28 | %
Expected dividend yield | — |  |  | — |  |  | — |
Schedule Restricted Stock Units, Activity |
| Number of Restricted Stock Units |  | Aggregate Intrinsic Value (in millions) |  | Number of Performance Share Units |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016 | 70,547 |  |  | $ | 29.5 |  |  | 4,532 |  |  | $ | 1.9 |
Granted | 13,202 |  |  |  |  |  | 3,518 |  |  |
Vested | (24,851 | ) |  |  |  |  | — |  |  |
Forfeited | (2,509 | ) |  |  |  |  | — |  |  |
Outstanding at December 31, 2017 | 56,389 |  |  | $ | 34.9 |  |  | 8,050 |  |  | $ | 5.0 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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=96867065&loc=d3e5070-113901 + Details
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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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