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Equity Incentive Programs (Tables)
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes-Merton option pricing model. The fair market value of the stock options is determined using the following weighted average assumptions:

 
2012
Expected volatility
36.7
%
Risk-free interest rate
1.3
%
Expected life (years)
7.0

Dividend yield
7.1
%
Schedule of Share-based Compensation, Stock Options, Activity
The following table is a summary of the stock option activity for the six months ended June 30, 2013:

 
Shares Under
Option
 
Weighted Average
Exercise
Price
 
Weighted Average
Remaining
Contractual Term
(years)
 
Aggregate
Intrinsic Value
(millions)
Outstanding at December 31, 2012
4,407,125

 
$
20.34

 
6.8
 
$
15.2

Granted
—

 
—

 

 


Exercised
(111,075
)
 
14.89

 
 
 


Cancelled/forfeited/expired
(90,173
)
 
28.12

 
 
 


Outstanding at June 30, 2013
4,205,877

 
$
20.47

 
6.4
 
$
23.9

 
 
 
 
 
 
 
 
Vested and expected to vest at June 30, 2013
4,195,511

 
$
20.49

 
6.4
 
$
23.8

Exercisable at June 30, 2013
2,501,653

 
$
20.01

 
6.1
 
$
13.7
Schedule of Share-based Compensation, Activity
The following table is a summary of the stock option exercises and vesting activity for the three and six months ended June 30, 2013 and 2012:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Total intrinsic value of stock options exercised
$
0.7

 
$
—

 
$
0.9

 
$
—

Cash received from stock option exercises
1.2

 
—

 
1.7

 
—

Total grant date fair value of stock options vested
—

 
—

 
1.8

 
—
Schedule of Nonvested Performance-based Units Activity
The following table is a summary of PS and PSU award activity for the six months ended June 30, 2013:

 
Performance Shares
 
Performance Share Units
 
Shares
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
Weighted-
Average
Remaining Contractual Term (years)
 
Units
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
Weighted-
Average
Remaining Contractual Term (years)
Nonvested at December 31, 2012
—

 
$
—

 
—

 
—

 
$
—

 
—

Granted
389,930

 
20.39

 
 
 
16,208

 
20.50

 
 
Vested
—

 
—

 
 
 
—

 
—

 
 
Forfeited
(21,524
)
 
20.39

 
 
 
—

 
—

 
 
Nonvested at June 30, 2013
368,406

 
$
20.39

 
2.5

 
16,208

 
$
20.50

 
2.5
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table is a summary of RS and RSU award activity for the six months ended June 30, 2013:

 
Restricted Stock
 
Restricted Stock Units
 
Shares
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Units
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
Weighted-
Average
Remaining
Contractual
Term (years)
Nonvested at December 31, 2012
415,906

 
$
21.24

 
1.7
 
22,438

 
$
21.17

 
1.7
Granted
408,146

 
20.39

 
 
 
32,671

 
20.72

 
 
Vested
—

 
—

 
 
 
—

 
—

 
 
Forfeited
(49,812
)
 
20.74

 
 
 
—

 
—

 
 
Nonvested at June 30, 2013
774,240

 
$
20.87

 
1.9
 
55,109

 
$
20.90

 
2.0