Common Equity (Tables)

6 Months Ended

Jun. 30, 2013

Common Equity (Tables) [Abstract]

Shares Repurchased [Table Text Block]

	Six Months Ended June 30
	2013			2012
	Shares	Cost		Shares	Cost
	(In Millions)
Under May 2011 share repurchase program	1.3	$	54.7	—	$	—
To fulfill exercised stock options and restricted stock awards	2.0	81.0		2.1	75.7
Total	3.3	$	135.7	2.1	$	75.7

Assumptions for valuing options using binomial option pricing model

	2013		2012
Risk-free interest rate	0.1% - 1.9%		0.1% - 2.0%
Dividend yield	3.7	%	3.9	%
Expected volatility	18.0	%	19.0	%
Expected forfeiture rate	2.0	%	2.0	%
Expected life (years)	5.9		5.9

Stock option activity

					Weighted-
					Average
			Weighted-		Remaining	Aggregate
	Number of		Average		Contractual Life	Intrinsic Value
Stock Options	Options		Exercise Price		(Years)	(Millions)
Outstanding as of April 1, 2013	9,064,023		$	26.34
Granted	—		$	—
Exercised	(574,415	)	$	23.33
Forfeited	(5,350	)	$	35.38
Outstanding as of June 30, 2013	8,484,258		$	26.53
Outstanding as of January 1, 2013	8,919,669		$	23.86
Granted	1,418,560		$	37.46
Exercised	(1,848,621	)	$	22.00
Forfeited	(5,350	)	$	35.38
Outstanding as of June 30, 2013	8,484,258		$	26.53	5.7	$	122.6
Exercisable as of June 30, 2013	6,090,173		$	22.94	4.5	$	109.9

Stock options outstanding

	Options Outstanding				Options Exercisable
		Weighted-Average				Weighted-Average
				Remaining				Remaining
	Number of	Exercise		Contractual	Number of	Exercise		Contractual
Range of Exercise Prices	Options	Price		Life (Years)	Options	Price		Life (Years)
$16.72 to $21.11	2,462,368	$	20.21	4.1	2,462,368	$	20.21	4.1
$23.88 to $29.35	3,746,540	$	24.65	4.7	3,436,600	$	24.22	4.5
$34.87 to $37.46	2,275,350	$	36.48	9.1	191,205	$	35.14	8.6
	8,484,258	$	26.53	5.7	6,090,173	$	22.94	4.5

Non-vested options

			Weighted-Average
Non-Vested Stock Options	Number of Options		Fair Value
Non-vested as of April 1, 2013	2,430,430		$	3.38
Granted	—		$	—
Vested	(30,995	)	$	3.37
Forfeited	(5,350	)	$	3.37
Non-vested as of June 30, 2013	2,394,085		$	3.38
Non-vested as of January 1, 2013	1,702,275		$	3.31
Granted	1,418,560		$	3.45
Vested	(721,400	)	$	3.34
Forfeited	(5,350	)	$	3.37
Non-vested as of June 30, 2013	2,394,085		$	3.38

Restricted stock activity

			Weighted-Average
Restricted Shares	Number of Shares		Grant Date Fair Value
Outstanding as of April 1, 2013	167,729
Granted	—		$	—
Released	(14,888	)	$	20.88
Forfeited	(1,570	)	$	35.30
Outstanding as of June 30, 2013	151,271
Outstanding as of January 1, 2013	188,222
Granted	74,290		$	37.65
Released	(97,973	)	$	26.65
Forfeited	(13,268	)	$	33.28
Outstanding as of June 30, 2013	151,271