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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock-based compensation expense and the related deferred tax benefit recognized in income

The following table reflects the stock-based compensation expense and the related deferred tax benefit recognized in income for the three and six months ended June 30:



	Three Months Ended June 30				Six Months Ended June 30
(Millions)	2013		2012		2013		2012
Stock options	$	0.5	$	0.6	$	0.9	$	1.0
Performance stock rights	1.0		3.1		3.2		4.3
Restricted share units	2.5		3.3		5.3		5.4
Nonemployee director deferred stock units	0.2		—		0.5		1.0
Total stock-based compensation expense	$	4.2	$	7.0	$	9.9	$	11.7
Deferred income tax benefit	$	1.7	$	2.8	$	4.0	$	4.7

Schedule of weighted-average fair values per stock option along with the assumptions incorporated into the valuation models

The following table shows the weighted-average fair value per stock option granted during the six months ended June 30, 2013, along with the assumptions incorporated into the valuation model:



		February 2013 Grant
Weighted-average fair value per option		$6.03
Expected term		5 years
Risk-free interest rate		0.18% – 2.11%
Expected dividend yield		5.33%
Expected volatility		24%

Summary of stock option activity and information related to outstanding and exercisable stock options

A summary of stock option activity for the six months ended June 30, 2013, and information related to outstanding and exercisable stock options at June 30, 2013, is presented below:



	Stock Options		Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life (in Years)	Aggregate Intrinsic Value (Millions)
Outstanding at December 31, 2012	2,046,355		$	49.25
Granted	319,234		56.00
Exercised	(642,347	)	48.55
Outstanding at June 30, 2013	1,723,242		$	50.76	6.6	$	13.4
Exercisable at June 30, 2013	967,444		$	49.73	5.0	$	8.5

Disclosure of performance stock rights assumptions

The table below reflects the assumptions used in the valuation of the outstanding grants at June 30:



		2013
Risk-free interest rate		0.26% – 1.27%
Expected dividend yield		5.18% – 5.34%
Expected volatility		19% – 36%

Summary of the activity related to restricted share unit awards (equity and liability awards)

A summary of the activity related to all restricted share unit awards (equity and liability awards) for the six months ended June 30, 2013, is presented below:



	Restricted Share Unit Awards		Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2012	505,690		$	48.38
Granted	189,594		56.01
Dividend equivalents	11,848		52.20
Vested and released	(204,419	)	46.27
Forfeited	(2,415	)	51.31
Outstanding at June 30, 2013	500,298		$	52.21

Performance Stock Rights Accounted For As Equity Awards

Summary of the activity related to performance stock rights

A summary of the activity for the six months ended June 30, 2013, related to performance stock rights accounted for as equity awards is presented below:



	Performance Stock Rights		Weighted-Average Fair Value *
Outstanding at December 31, 2012	108,314		$	65.38
Granted	22,636		48.50
Distributed	(94,758	)	72.36
Adjustment for final payout	21,867		72.36
Outstanding at June 30, 2013	58,059		$	50.04


*	Reflects the weighted-average fair value used to measure equity awards. Equity awards are measured using the grant date fair value or the fair value on the modification date.

Performance Stock Rights Accounted For As Liability Awards

Summary of the activity related to performance stock rights

A summary of the activity for the six months ended June 30, 2013, related to performance stock rights accounted for as liability awards is presented below:



	Performance Stock Rights
Outstanding at December 31, 2012	189,093
Granted	90,496
Distributed	(61,753	)
Adjustment for final payout	14,255
Outstanding at June 30, 2013	232,091