Share-Based Awards (Details - Other Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share Based Compensation Arrangements - Other details
Share based compensation expense	$ 24.2	$ 33.5	$ 21.7
Tax benefit of share-based compensation expense	2.4	3.4	2.7
Tax Benefit Realized from Exercise of Stock Options	3.1	5.9	1.6
[ShareOptionsMember]
Assumptions:
Expected life	6	6	3
Expected volatility	14.90%	15.80%	15.80%
Risk-free interest rate	2.00%	2.80%	2.80%
Dividend yield	2.70%	2.70%	2.70%
[ShareSettledShareAppreciationRightsMember]
Share Based Compensation Arrangements - Other details
Weighted average grant date fair value	$ 10.32	$ 10.45	$ 8.42
Unrecognized share-based compensation expense	3.1
Weighted average period of recognition	1.7
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward
Outstanding at beginning of year	1,337,350
Granted	210,582	450,568	105,344
Exercised	(21,462)
Forfeited or expired	(11,263)
Outstanding at end of year	1,515,207	1,337,350
Exercisable	1,031,110
Assumptions:
Expected life	6	6	6
Expected volatility	15.60%	15.80%	15.40%
Risk-free interest rate	2.70%	2.80%	2.70%
Dividend yield	2.80%	2.70%	2.60%
[ReplacementAwardsWarrantsMember]
Share Based Compensation Arrangements - Other details
Weighted average remaining contractual term	4
Weighted average exercise price, exercises during period	$ 35.33
Weighted average exercise price	$ 34.42
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward
Granted			27,655
Exercised	7,993
Outstanding at end of year	15,270
[RestrictedShareUnitsMember]
Share Based Compensation Arrangements - Other details
Weighted average grant date fair value	$ 81.20	$ 79.18	$ 75.09
Fair value of units vested	18.3	30.9	9.6
Restricted stock units - delivery date restrictions	34,866
Unrecognized share-based compensation expense	26.4
Weighted average period of recognition	1.8
Restriction on sale or transfer, in years	5
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward
Outstanding at beginning of year	868,002
Granted	314,182	374,366	607,173
Released	(462,912)
Forfeited	(23,528)
Outstanding at end of year	695,744	868,002
Employee Equity Plan [Line Items]
Vesting period for EEP shares	3
[EmployeeEquityPlanMember]
Employee Equity Plan [Line Items]
Maximum individual award in unit terms	800,000
Maximum individual award in dollar terms	$ 5
Amendment to authorized shares that are allocated to RS/RSU			300,000
Increase in number of shares authorized under the plan			400,000
Total shares allocated to share options/ SSARs	4,900,000
Total shares allocated to RS/ RSUs	3,400,000
Total shares authorized under the plan	8,300,000
Shares remaining for issuance	5,400,000
Contractual term, in years	10