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Stock-Based Compensation Plans - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Additional share-based compensation disclosures
Total unrecognized compensation cost				$ 39.5
Weighted average recognition period for unrecognized compensation cost (in years)	1 year 3 months 29 days
Restricted stock, 2017 grant
Restricted Shares
Awards granted (in shares)	446,525
The number of grants made during the period on the basis of service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).	169,009
Fair value of restricted stock granted (in dollars per share)	$ 79.60
Share of common stock	1
Changes restricted stock grants and RSUs
Granted (in shares)	446,525
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)	$ 79.60
Restricted stock, 2016 grant
Restricted Shares
Awards granted (in shares)		512,895
The number of grants made during the period on the basis of service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).		190,175
Fair value of restricted stock granted (in dollars per share)		$ 69.16
Share of common stock		1
Changes restricted stock grants and RSUs
Granted (in shares)		512,895
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)		$ 69.16
Restricted stock, 2015 grant
Restricted Shares
Awards granted (in shares)			507,760
The number of grants made during the period on the basis of service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).			185,450
Fair value of restricted stock granted (in dollars per share)			$ 59.27
Share of common stock			1
Changes restricted stock grants and RSUs
Granted (in shares)			507,760
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)			$ 59.27
Restricted stock and RSUs
Restricted Shares
Awards granted (in shares)	446,525
Fair value of restricted stock granted (in dollars per share)	$ 79.60
Number of shares unvested and outstanding	985,540	985,540		924,575
Changes restricted stock grants and RSUs
Unvested at the beginning of the period (in shares)	985,540
Granted (in shares)	446,525
Vested (in shares)	(467,968)
Cancelled or forfeited (in shares)	(39,522)
Unvested at the end of the period (in shares)	924,575	985,540
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 64.34
Granted (in dollars per shares)	79.60
Vested (in dollars per shares)	59.33
Cancelled or forfeited (in dollars per shares)	67.99
Unvested at the end of the period (in dollars per shares)	$ 74.09	$ 64.34
Restricted stock
Restricted Shares
Payments to tax authorities on employees' behalf for shares withheld related to share settlements	$ 9.3	$ 6.4	$ 4.5
Time-based | RSU's | Former CEO
Restricted Shares
Awards granted (in shares)			10,000
Changes restricted stock grants and RSUs
Granted (in shares)			10,000
Performance-based | RSU's
Restricted Shares
Performance target period (in years)	3 years
Performance-based | RSU's | Former CEO
Restricted Shares
Awards granted (in shares)			40,000
Changes restricted stock grants and RSUs
Granted (in shares)			40,000
Directors Equity Plan | Restricted stock
Restricted Shares
Awards granted (in shares)	18,120	11,851	12,719
Fair value of restricted stock granted (in dollars per share)	$ 71.73	$ 70.88	$ 66.03
Changes restricted stock grants and RSUs
Granted (in shares)	18,120	11,851	12,719
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)	$ 71.73	$ 70.88	$ 66.03

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