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Stock-based Compensation (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Restricted stock unit activity [Roll Forward]
Unvested at beginning of period (in shares)	775,900		817,300		750,900	706,000	706,000
Granted (in shares)	5,100		27,000		157,000	277,600
Vested (in shares)	(70,900)		(96,200)		(177,300)	(190,800)
Forfeited (in shares)	(800)		(2,400)		(21,300)	(47,100)
Unvested at end of period (in shares)	709,300	775,900	745,700	817,300	709,300	745,700	750,900	706,000
Unvested shares expected to vest (in shares)	709,300		726,000		709,300	726,000
Restricted stock unit activity, additional disclosures [Abstract]
Weighted average grant date fair value, beginning of period (in dollars per share)	$ 117.74		$ 112.58		$ 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	115.47		112.75		116.50	107.96
Weighted average grant date fair value, vested (in dollars per share)	112.64		101.71		99.24	96.51
Weighted average grant date fair value, forfeited (in dollars per share)	130.32		107.79		113.18	116.07
Weighted average grant date fair value, end of period (in dollars per share)	118.22	$ 117.74	114.00	$ 112.58	118.22	114.00	$ 113.97	$ 111.78
Weighted average grant date fair value, unvested shares expected to vest (in dollars per share)	$ 118.22		$ 114.10		$ 118.22	$ 114.10
Weighted average remaining contractual life, unvested shares outstanding	1 year 5 months 5 days	1 year 7 months 9 days	1 year 10 months 29 days	2 years	1 year 5 months 5 days	1 year 10 months 29 days	1 year 8 months 15 days	2 years 10 days
Weighted average remaining contractual life, unvested shares outstanding, expected to vest	1 year 5 months 5 days		1 year 11 months		1 year 5 months 5 days	1 year 11 months
Unamortized deferred compensation cost	$ 25.1				$ 25.1

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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.

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The weighted average grant date fair value of unvested awards on equity-based plans excluding option plans that are expected to vest.

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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.

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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).

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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).

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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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