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Stock-Based Compensation Plans - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Additional share-based compensation disclosures
Total unrecognized compensation cost				$ 34.6
Weighted average recognition period for unrecognized compensation cost (in years)	1 year 1 month 13 days
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 in unvested 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 in unvested 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, 2014 grant
Restricted Shares
Awards granted (in shares)			349,380
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).			136,162
Fair value of restricted stock granted (in dollars per share)			$ 71.15
Share of common stock			1
Changes in unvested restricted stock grants and RSUs
Granted (in shares)			349,380
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)			$ 71.15
Restricted stock and RSUs
Restricted Shares
Awards granted (in shares)	524,746
Fair value of restricted stock granted (in dollars per share)	$ 69.20
Number of shares unvested and outstanding	900,410	900,410		985,540	900,410
Changes in unvested restricted stock grants and RSUs
Unvested at the beginning of the year (in shares)	900,410
Granted (in shares)	524,746
Forfeited (in shares)	(93,814)
Vested (in shares)	(345,802)
Unvested at the end of the year (in shares)	985,540	900,410
Weighted Average Grant Date Fair Value
Unvested at the beginning of the year (in dollars per share)	$ 63.26
Granted (in dollars per shares)	69.20
Forfeited (in dollars per shares)	67.90
Vested (in dollars per shares)	67.96
Unvested at the end of the year (in dollars per shares)	$ 64.34	$ 63.26
Restricted stock
Restricted Shares
Payments to tax authorities on employees' behalf for shares withheld related to share settlements	$ 6.4	$ 4.5	$ 0.5
Time-based | RSU's | Former CEO
Restricted Shares
Awards granted (in shares)	10,000
Changes in unvested 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 in unvested restricted stock grants and RSUs
Granted (in shares)	40,000
Directors Equity Plan | Restricted stock
Restricted Shares
Awards granted (in shares)	11,851	12,719	11,830
Fair value of restricted stock granted (in dollars per share)	$ 70.88	$ 66.03	$ 70.99
Changes in unvested restricted stock grants and RSUs
Granted (in shares)	11,851	12,719	11,830
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)	$ 70.88	$ 66.03	$ 70.99

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