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Stock-Based Compensation Plans - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2015	Dec. 31, 2014
Additional share-based compensation disclosures
Total unrecognized compensation cost						$ 27.3
Weighted average recognition period for unrecognized compensation cost (in years)	1 year 4 months 10 days
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, 2013 grant
Restricted Shares
Awards granted (in shares)			327,780
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).			136,225
Fair value of restricted stock granted (in dollars per share)			$ 65.75
Share of common stock			1
Changes in unvested restricted stock grants and RSUs
Granted (in shares)			327,780
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)			$ 65.75
Restricted stock, 2011 grant
Restricted Shares
Awards granted (in shares)				86,000
Fair value of restricted stock granted (in dollars per share)				$ 37.29
Changes in unvested restricted stock grants and RSUs
Granted (in shares)				86,000
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)				$ 37.29
Restricted stock, 2010 grant
Restricted Shares
Awards granted (in shares)					61,000
Fair value of restricted stock granted (in dollars per share)					$ 41.24
Changes in unvested restricted stock grants and RSUs
Granted (in shares)					61,000
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)					$ 41.24
Restricted stock and RSUs
Restricted Shares
Awards granted (in shares)	570,479
Fair value of restricted stock granted (in dollars per share)	$ 59.42
Number of shares unvested and outstanding	846,760	846,760				900,410	846,760
Changes in unvested restricted stock grants and RSUs
Unvested at the beginning of the period (in shares)	846,760
Granted (in shares)	570,479
Forfeited (in shares)	(106,205)
Vested (in shares)	(410,624)
Unvested at the end of the period (in shares)	900,410	846,760
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 65.10
Granted (in dollars per shares)	59.42
Forfeited (in dollars per shares)	60.03
Vested (in dollars per shares)	62.56
Unvested at the end of the period (in dollars per shares)	$ 63.26	$ 65.10
Restricted stock 2010 and 2011 grant
Restricted Shares
Vesting period (in years)	5 years
Number of shares unvested and outstanding	17,200					17,200
Changes in unvested restricted stock grants and RSUs
Unvested at the end of the period (in shares)	17,200
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)	12,719	11,830	12,418
Fair value of restricted stock granted (in dollars per share)	$ 66.03	$ 70.99	$ 67.63
Changes in unvested restricted stock grants and RSUs
Granted (in shares)	12,719	11,830	12,418
Weighted Average Grant Date Fair Value
Granted (in dollars per shares)	$ 66.03	$ 70.99	$ 67.63

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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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