Share-Based Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based employee compensation expense	$ 86.3	$ 80.8	$ 74.5
Unamortized share-based employee compensation, amortization period	5 years
Unamortized share-based employee compensation	257.2
Option Activity [Roll Forward]
Balance January 1	5,590,880	18,301,409	24,513,590
Options granted	60,000	60,000	90,000
Options exercised	(3,021,200)	(12,673,529)	(6,034,181)
Options (forfeited) reinstated	14,000	(97,000)	(268,000)
Balance December 31	2,643,680	5,590,880	18,301,409
Exercisable December 31	2,505,680	5,333,880	9,672,909
Balance January 1, Weighted Average Exercise Price	$ 25.72	$ 26.22	$ 26.64
Options granted, Weighted Average Exercise Price	$ 70.68	$ 49.65	$ 45.05
Options exercised, Weighted Average Exercise Price	$ 26.01	$ 26.47	$ 28.17
Options (forfeited) reinstated, Weighted Average Exercise Price	$ 23.40	$ 35.98	$ 27.15
Balance December 31, Weighted Average Exercise Price	$ 26.39	$ 25.72	$ 26.22
Exercisable December 31, Weighted Average Exercise Price	$ 24.67	$ 24.89	$ 27.85
Options Outstanding and Exercisable [Abstract]
Options Outstanding, Shares	2,643,680
Options Exercisable, Shares	2,505,680
Black-Scholes Assumptions and Weighted Average Fair Value Per Share for Options Granted [Abstract]
Expected option lives	5 years	5 years	5 years
Risk free interest rate	1.40%	0.80%
Risk free interest rate, minimum			0.90%
Risk free interest rate, maximum			1.80%
Expected volatility	26.00%	29.50%
Expected volatility, minimum			27.20%
Expected volatility, maximum			29.20%
Dividend yield	2.00%	3.10%
Weighted average fair value per option granted	$ 14.50	$ 10.42	$ 9.57
Exercise Price Range - $23.40 to $29.99
Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit	$ 23.40
Range of Exercise Prices, upper range limit	$ 29.99
Options Outstanding, Shares	2,337,680
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 2 months
Options Outstanding, Weighted Average Exercise Price	$ 23.60
Options Exercisable, Shares	2,337,680
Options Exercisable, Weighted Average Exercise Price	$ 23.60
Exercise Price Range - $30.00 to $44.99
Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit	$ 30.00
Range of Exercise Prices, upper range limit	$ 44.99
Options Outstanding, Shares	163,000
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 8 months
Options Outstanding, Weighted Average Exercise Price	$ 38.78
Options Exercisable, Shares	139,000
Options Exercisable, Weighted Average Exercise Price	$ 37.97
Exercise Price Range - $45.00 to $59.99
Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit	$ 45.00
Range of Exercise Prices, upper range limit	$ 59.99
Options Outstanding, Shares	83,000
Options Outstanding, Weighted Average Remaining Contractual Life	8 years 2 months
Options Outstanding, Weighted Average Exercise Price	$ 48.64
Options Exercisable, Shares	29,000
Options Exercisable, Weighted Average Exercise Price	$ 47.37
Exercise Price Range - $60.00 to $70.68
Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit	$ 60.00
Range of Exercise Prices, upper range limit	$ 70.68
Options Outstanding, Shares	60,000
Options Outstanding, Weighted Average Remaining Contractual Life	9 years 11 months
Options Outstanding, Weighted Average Exercise Price	$ 70.68
Options Exercisable, Shares	0
Options Exercisable, Weighted Average Exercise Price	$ 0.00
Stock Options [Member]
Share-based employee compensation, terms of award	The exercise price of stock option awards may not be less than 100% of the market price of our common stock on the grant date and the option term cannot exceed ten years from the grant date.
Share-based employee compensation, vesting rights	Typically, stock option awards vest 30% per year for the first two years and are fully vested three years from the grant date.
Restricted Stock [Member]
Share-based employee compensation, vesting rights	Restricted shares typically vest 20% per year, provided the employee remains employed by us and are fully vested five years from the grant date.
Restricted Stock and PRSU Activity [Roll Forward]
Balance January 1	7,241,490	6,038,978	3,026,086
Shares granted	706,900	2,515,127	4,274,807
Shares vested	(1,490,786)	(981,737)	(1,096,441)
Shares forfeited	(366,907)	(330,878)	(165,474)
Balance December 31	6,090,697	7,241,490	6,038,978
Restricted Stock and PRSU Activity, Weighted Average Grant Date Fair Value [Roll Forward]
Balance January 1, Weighted Average Grant Date Fair Value	$ 45.34	$ 43.32
Granted, Weighted Average Grant Date Fair Value	$ 60.98	$ 49.55	$ 44.51
Balance December 31, Weighted Average Grant Date Fair Value	$ 47.47	$ 45.34	$ 43.32
Performance Restricted Stock Units (PRSUs) [Member]
Share-based employee compensation, vesting rights	Each PRSU represents the right to receive one share of common stock on vesting. The ultimate number of PRSUs received by the employee depends on the Company's average return on equity over a three year period compared to the average return on equity of a peer group of four principal competitors over the same period. The 2011 PRSUs vest over five years and the 2012 and 2013 PRSUs vest over three years.
Restricted Stock and PRSU Activity [Roll Forward]
Balance January 1	538,948	413,909	0
Shares granted	183,998	166,426	413,909
Shares vested	(41,391)	(41,387)	0
Shares forfeited	0	0	0
Balance December 31	681,555	538,948	413,909
Restricted Stock and PRSU Activity, Weighted Average Grant Date Fair Value [Roll Forward]
Balance January 1, Weighted Average Grant Date Fair Value	$ 48.74	$ 48.56	$ 0.00
Granted, Weighted Average Grant Date Fair Value	$ 57.77	$ 49.13	$ 48.56
Distributed, Weighted Average Grant Date Fair Value	$ 48.56	$ 48.56	$ 0.00
Forfeited, Weighted Average Grant Date Fair Value	$ 0.00	$ 0.00	$ 0.00
Balance December 31, Weighted Average Grant Date Fair Value	$ 51.19	$ 48.74	$ 48.56
Employee Stock Purchase Plan [Member]
Shares available for grant	9,191,376
Employee Stock Purchase Plan (ESPP) [Abstract]
Discount from market price	95.00%
Maximum percentage of eligible compensation allowable for purchase	10.00%
Shares issued in period	175,002	189,307	161,929
Proceeds from issuance of shares	$ 9.9	$ 8.6	$ 7.0
2013 Incentive Award Plan [Member]
Maximum of shares available for issuance	33,040,000
Stock awards other than options, conversion ratio	3.5
Shares available for grant	32,762,420
Stock awards other than options, shares available for grant	9,360,691
Minimum [Member]
Black-Scholes Assumptions and Weighted Average Fair Value Per Share for Options Granted [Abstract]
Dividend yield			2.30%
Maximum [Member]
Black-Scholes Assumptions and Weighted Average Fair Value Per Share for Options Granted [Abstract]
Dividend yield			2.80%