Stock-Based Compensation Programs (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		1 Months Ended		9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended		1 Months Ended		9 Months Ended	1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jan. 31, 2013 Stock option and SSARs	Jan. 31, 2012 Stock option and SSARs	Sep. 30, 2013 Stock option and SSARs installment	Dec. 31, 2012 Stock option and SSARs	Sep. 30, 2013 Stock options	Sep. 30, 2013 Stock options	Sep. 30, 2013 Restricted shares and restricted stock units	Jan. 31, 2013 Performance-contingent restricted stock units	Jan. 31, 2012 Performance-contingent restricted stock units	Sep. 30, 2013 Performance-contingent restricted stock units	Jan. 31, 2013 Performance-contingent restricted stock units Minimum	Jan. 31, 2013 Performance-contingent restricted stock units Maximum	Apr. 24, 2013 Options, SSARs and restricted shares
Stock-Based Compensation Programs
Number of equal installments commencing one year from the date of grant							4
Vesting period											5 years
Expiration period of options							P10Y
Outstanding Options, Number of Shares
Beginning of year (in shares)					9,982,104		9,982,104
Granted (in shares)							1,364,870
Exercised (in shares)							(1,046,369)
Canceled/forfeited (in shares)							(48,625)
End of the period (in shares)							10,251,980	9,982,104
Vested and exercisable, end of period (in shares)							6,866,980
Reserved for future grants (in shares)							12,412,861
Shares authorized for future grants																	12,500,000
Outstanding Options, Weighted Average Exercise Price
Beginning of year (in dollars per share)					$ 26.71		$ 26.71
Granted (in dollars per share)							$ 45.93
Exercised (in dollars per share)							$ 23.14
Canceled/forfeited (in dollars per share)							$ 37.62
End of period (in dollars per share)							$ 29.59	$ 26.71
Vested and exercisable, end of period (in dollars per share)							$ 24.79
Weighted average remaining contractual term of options outstanding							6 years
Aggregate intrinsic value of options outstanding							$ 158.2
Weighted average remaining contractual term of options vested and exercisable							4 years 9 months 18 days
Aggregate intrinsic value of options vested and exercisable							138.0
Weighted average fair value at grant date (in dollars per share)							$ 8.69	$ 9.44
Cash received from options exercised									5.2	14.1
Intrinsic value of options exercised									4.6	13.8
Tax benefit from exercise of options										10.5
Weighted average assumptions used in estimation of fair values of options
Expected dividend yield (as a percent)					1.13%	1.06%
Expected stock price volatility (as a percent)					22.02%	30.22%
Risk-free interest rate (as a percent)					1.02%	0.84%
Expected life of options					5 years 6 months	5 years 3 months 4 days
Restricted stock activity, Number of shares
Beginning of the period (in shares)											1,763,636
Granted (in shares)											185,845	148,875	223,600
Vested (in shares)											(493,910)
Canceled/forfeited (in shares)											(5,502)
End of the period (in shares)											1,450,069
Restricted stock activity, Weighted average grant price
Beginning of the period (in dollars per share)											$ 28.97
Granted (in dollars per share)											$ 46.11
Vested (in dollars per share)											$ 26.61
Canceled/forfeited (in dollars per share)											$ 34.21
End of the period (in dollars per share)											$ 31.95
Vest range of participant's assigned award opportunity (as a percent)															0.00%	200.00%
Company performance period for vesting of award														36 months
Share based compensation expense	5.6	6.6	19.0	20.2
Expenses for share-based compensation arrangements, after tax	3.5	4.0	11.6	12.3
Unrecognized compensation cost related to nonvested share-based compensation arrangements	$ 38.9		$ 38.9
Expected weighted-average period for recognition of unrecognized stock-based compensation costs			2 years 2 months 12 days