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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Summary of the total compensation expense and associated recognized income tax benefits  
 
Years Ended December 31,
 
2013
 
2012
 
2011
Compensation expense
$
36.1

 
$
30.3

 
$
31.0

Income tax benefit
(14.0
)
 
(11.7
)
 
(12.0
)
Total
$
22.1

 
$
18.6

 
$
19.0
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions  
Assumption
2013 Grants
 
2012 Grants
 
2011 Grants
Expected volatility
N/A
 
81.5
%
 
36.7
%
Expected dividend yield
N/A
 
—
%
 
—
%
Expected term (years)
N/A
 
3

 
6.25

Risk-free interest rate
N/A
 
0.40
%
 
2.56
%
Weighted-average grant date fair value
N/A
 
$
14.62

 
$
5.93
Schedule of Share-based Compensation, Stock Options, Activity  
A summary of option activity under the Stock Incentive Plan and the Omnibus Plan as of December 31, 2013 is presented below.
Options
Shares (In millions)
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Aggregate Intrinsic
Value (In millions
of dollars)
Outstanding at January 1, 2013
13.2

 
$
11.13

 
5.4
 
$
74.7

Granted
—

 
—

 
 
 
 
Exercised
(3.0
)
 
9.64

 
 
 
 
Forfeited or Expired
(0.2
)
 
12.1

 
 
 
 
Outstanding at December 31, 2013
10.0

 
$
11.55

 
4.5
 
$
170.1

Exercisable at December 31, 2013
8.5

 
$
11.37

 
4.1
 
$
146.6
Schedule of Share Based Compensation Nonvested Stock Options Activity  
A summary of non-vested options as of December 31, 2013, and changes during the year, is presented below.
 
Non-vested
Shares (In millions)
 
Weighted-
Average
Exercise Price
 
Weighted-
Average Grant-
Date Fair
Value
Non-vested as of January 1, 2013
2.9

 
$
12.23

 
$
4.98

Granted
—

 
—

 
—

Vested
(1.3
)
 
11.69

 
4.77

Forfeited
(0.1
)
 
12.1

 
5.42

Non-vested as of December 31, 2013
1.5

 
$
12.60

 
5.13
Schedule of Share Based Payment Awards, Additional Stock Option Activity  
Additional information pertaining to option activity under the plans is as follows (in millions of dollars):
 
Years ended
December 31,
 
2013
 
2012
 
2011
Aggregate intrinsic value of stock options exercised
$
42.0

 
$
15.1

 
$
15.0

Cash received from the exercise of stock options
26.9

 
11.2

 
13.1

Fair value of options that vested
6.0

 
9.0

 
17.4

Tax benefit realized on exercise of stock options
1.3

 
0.9

 
0.5
Schedule of Share Based Compensation, Performance Based Units, Activity
A summary of the PSU activity under the Omnibus Plan as of December 31, 2013 is presented below.
 
Shares (In millions)
 
Weighted-
Average
Fair Value
 
Aggregate Intrinsic
Value (In millions
of dollars)
Outstanding at January 1, 2013
2.3

 
$
12.18

 
$
37.4

Granted
1.7

 
19.95

 
 
Vested
(0.4
)
 
10.40

 
 
Forfeited or Expired
(0.3
)
 
15.24

 
 
Outstanding at December 31, 2013
3.3

 
$
15.68

 
$
95.8

  
Schedule of Share Based Compensation Restricted Stock Units and Performance Based Units Activity
A summary of RSU activity under the Omnibus Plan as of December 31, 2013 is presented below.
 
Shares (In millions)
 
Weighted-
Average
Fair Value
 
Aggregate Intrinsic
Value (In millions
of dollars)
Outstanding at January 1, 2013
1.9

 
$
12.62

 
$
30.5

Granted
0.3

 
23.95

 
 
Vested
(1.1
)
 
11.64

 
 
Forfeited or Expired
(0.2
)
 
13.68

 
 
Outstanding at December 31, 2013
0.9

 
$
17.00

 
$
25.6

  
Schedule of Share Based Compensation Restricted Stock Units and Performance Based Units Additional Information
Additional information pertaining to RSU activity is as follows:
 
Years ended December 31,
 
2013
 
2012
 
2011
Total fair value of awards that vested ($ millions)
$
12.9

 
$
14.6

 
$
9.6

Weighted average grant date fair value of awards
$
23.95

 
$
13.78

 
$
14.78