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Stock-based Compensation (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Restricted stock unit activity [Roll Forward] |  |  |  |  |  |  |  |
Unvested at beginning of period (in shares) | 785,700 | 750,900 | 820,400 | 706,000 | 750,900 | 706,000 | 706,000 |
Granted (in shares) | 11,100 |  | 49,700 |  | 151,900 | 250,600 |  |
Vested (in shares) | (3,300) |  | (9,700) |  | (106,400) | (94,600) |  |
Forfeited (in shares) | (17,600) |  | (43,100) |  | (20,500) | (44,700) |  |
Unvested at end of period (in shares) | 775,900 | 785,700 | 817,300 | 820,400 | 775,900 | 817,300 | 750,900 | 706,000
Unvested shares expected to vest (in shares) | 775,900 |  | 796,100 |  | 775,900 | 796,100 |  |
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |  |  |  |  |
Weighted average grant date fair value, beginning of period (in dollars per share) | $ 117.62 | $ 113.97 | $ 112.83 | $ 111.78 | $ 113.97 | $ 111.78 | $ 111.78 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | 118.00 |  | 108.75 |  | 116.54 | 107.45 |  |
Weighted average grant date fair value, vested (in dollars per share) | 117.81 |  | 92.60 |  | 90.32 | 91.22 |  |
Weighted average grant date fair value, forfeited (in dollars per share) | 112.71 |  | 117.52 |  | 113.16 | 116.50 |  |
Weighted average grant date fair value, end of period (in dollars per share) | 117.74 | $ 117.62 | 112.58 | $ 112.83 | 117.74 | 112.58 | $ 113.97 | $ 111.78
Weighted average grant date fair value, unvested shares expected to vest (in dollars per share) | $ 117.74 |  | $ 112.69 |  | $ 117.74 | $ 112.69 |  |
Weighted average remaining contractual life, unvested shares outstanding | 1 year 7 months 10 days | 1 year 9 months 26 days | 2 years | 2 years 2 months 14 days | 1 year 7 months 10 days | 1 year 11 months 27 days | 1 year 8 months 16 days | 2 years 10 days
Weighted average remaining contractual life, unvested shares outstanding, expected to vest | 1 year 7 months 11 days |  | 2 years |  | 1 year 7 months 11 days | 1 year 11 months 29 days |  |
Unamortized deferred compensation cost | $ 30.7 |  |  |  | $ 30.7 |  |  |

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- Definition As of the balance sheet date, the number of shares into which outstanding unvested but expected to vest equity instruments other than options can be converted under the plan. + References No definition available. + Details
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- Definition The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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