Represents the number of stock 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).

No definition available.

Share-Based Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended														0 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock options	Dec. 31, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 31, 2013 Stock options Non-employee director	Dec. 31, 2011 Restricted stock, 2011 grant	Dec. 31, 2013 Restricted stock, 2012 grant	Dec. 31, 2012 Restricted stock, 2012 grant	Dec. 31, 2013 Restricted stock, 2013 grant	Dec. 31, 2013 Options with ten-year term Non-employee director	Dec. 31, 2010 Restricted stock, 2010 grant	Dec. 31, 2013 Restricted stock and RSUs	May 16, 2013 Restricted stock Directors Equity Plan	May 18, 2012 Restricted stock Directors Equity Plan	May 18, 2011 Restricted stock Directors Equity Plan	Dec. 31, 2013 Restricted stock Directors Equity Plan	Dec. 31, 2012 Restricted stock Directors Equity Plan	Dec. 31, 2013 Restricted stock 2010 and 2011 grant
Share-Based Compensation Plans
Shares authorized for future grant	2,894,863
Number of shares
Outstanding at the beginning of the period (in shares)				3,405,500	4,515,560	3,880,052
Granted (in shares)						1,037,250
Exercised (in shares)				(1,437,053)	(1,018,010)	(266,392)
Expired or forfeited (in shares)				(31,206)	(92,050)	(135,350)
Outstanding at the end of the period (in shares)				1,937,241	3,405,500	4,515,560	154,000					165,231
Exercisable at the end of the period (in shares)				1,253,516
Weighted Average Exercise Price
Outstanding at the beginning of the period, Weighted Average Exercise Price (in dollars per share)				$ 49.12	$ 47.39	$ 44.76
Granted, Weighted Average Exercise Price (in dollars per share)						$ 55.73
Exercised, Weighted Average Exercise Price (in dollars per share)				$ 48.78	$ 41.40	$ 41.60
Expired or forfeited, Weighted Average Exercise Price (in dollars per share)				$ 51.37	$ 49.55	$ 47.57
Outstanding at the end of the period, Weighted Average Exercise Price (in dollars per share)				$ 49.35	$ 49.12	$ 47.39
Exercisable at the end of the period, Weighted Average Exercise Price (in dollars per share)				$ 48.11
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term, stock options outstanding (in years)				3 years
Weighted Average Remaining Contractual Term, stock options exercisable (in years)				2 years 7 months 6 days
Aggregate Intrinsic Value (In millions)
Aggregate Intrinsic Value, options outstanding				$ 51.3
Aggregate Intrinsic Value, options exercisable				34.8
Vesting period (in years)				4 years			1 year													5 years
Award expiration term (in years)				7 years								10 years
Weighted average assumptions:
Exercise price (in dollars per share)						$ 55.73
Risk free interest rate (as a percent)						2.20%
Expected life (in years)						4 years 9 months 18 days
Expected volatility (as a percent)						60.00%
Expected dividend yield (as a percent)						0.86%
Grant date fair value (in dollars per share)						$ 26.98
Changes in non-vested stock options
Non-vested at the beginning of the period (in shares)				1,377,113
Forfeited (in shares)				(28,425)
Vested (in shares)				(664,963)
Non-vested at the end of the period (in shares)				683,725	1,377,113
Weighted Average Grant Date Fair Value
Non-vested options at the beginning of the period (in dollars per share)				$ 23.21
Forfeited (in dollars per shares)				$ 24.79
Vested (in dollars per shares)				$ 21.37
Non-vested options at the end of the period (in dollars per shares)				$ 24.93	$ 23.21
Restricted Shares
Restricted stock granted (in shares)								86,000		391,050	327,780		61,000	340,198			16,079	12,418	16,842
The number of grants made during the period on the basis 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).										138,700	136,225
Fair value of restricted stock granted (in dollars per share)								$ 37.29		$ 57.42	$ 65.75		$ 41.24	$ 65.82			$ 52.24	$ 67.63	$ 49.87
Share of common stock									1		1
Period of restriction for trading of shares automatically granted to directors															1 year	1 year
Number of shares unvested and outstanding														771,780						76,000
Changes in non-vested restricted stock grants and RSUs
Non-vested at the beginning of the period (in shares)														496,450
Granted (in shares)								86,000		391,050	327,780		61,000	340,198			16,079	12,418	16,842
Forfeited (in shares)														(23,050)
Vested (in shares)														(41,818)
Non-vested at the end of the period (in shares)														771,780						76,000
Weighted Average Grant Date Fair Value
Non-vested at the beginning of the period (in dollars per share)														$ 53.44
Granted (in dollars per shares)								$ 37.29		$ 57.42	$ 65.75		$ 41.24	$ 65.82			$ 52.24	$ 67.63	$ 49.87
Forfeited (in dollars per shares)														$ 58.72
Vested (in dollars per shares)														$ 47.45
Non-vested at the end of the period (in dollars per shares)														$ 59.06
Additional share-based compensation disclosures
Total unrecognized compensation cost				31.9
Weighted average recognition period for unrecognized compensation cost (in years)				1 year 3 months 25 days
Proceed from option exercises	70.1	42.1	11.1	70.1	42.1	11.1
Total intrinsic value of all options exercised				29.0	15.5	3.4
Tax benefit realized from option exercises				$ 11.5	$ 5.4	$ 1.3