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Stock-Based Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table summarizes the Company's stock-based compensation expense included as a component of general and administrative expenses in the consolidated financial statements:
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(In millions)
Total stock-based compensation expense:
 
 
 
 
 
Equity classified awards
$
9.4

 
$
9.4

 
$
11.4

Liability classified awards
2.4

 
0.9

 
4.8

Total pre-tax stock-based compensation expense
11.8

 
10.3

 
16.3

Tax benefit
(4.5
)
 
(3.9
)
 
(6.2
)
Total stock-based compensation expense, net of tax
$
7.3

 
$
6.4

 
$
10.1
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes the assumptions used to value options granted in the respective periods:
 
2014
 
2013
 
2012
Risk free interest rate
1.6
%
 
0.8
%
 
0.9
%
Weighted average historical volatility
51.1
%
 
83.4
%
 
84.5
%
Dividend yield
3.7
%
 
4.2
%
 
—
%
Expected years until exercise
4.6

 
4.6

 
4.7

Forfeitures
11.0
%
 
11.0
%
 
11.0
%
Weighted average fair value of options granted
$
26.87

 
$
36.00

 
$
33.53
Schedule of Share-based Compensation, Stock Options, Activity
Stock option activity for the years ended December 31, 2014, 2013 and 2012 is summarized as follows:
 
Number of
Shares Under Option
 
Weighted Average
Exercise Price
Per Share
 
Weighted Average
Remaining Contractual
Term (in Years)
 
Aggregate Intrinsic
Value (in Millions)
Outstanding at December 31, 2011
1,318,640

 
$
32.06

 
 
 
 

Granted
147,674

 
51.63

 
 
 
 

Exercised
(455,217
)
 
20.91

 
 
 
 

Forfeited
(39,381
)
 
46.97

 
 
 
 

Expired
(13,470
)
 
38.64

 
 
 
 

Outstanding at December 31, 2012
958,246

 
39.67

 
 
 
 

Granted
81,328

 
72.28

 
 
 
 

Exercised
(225,272
)
 
40.31

 
 
 
 

Forfeited
(39,243
)
 
55.78

 
 
 
 

Outstanding at December 31, 2013
775,059

 
42.09

 
 
 
 

Granted
120,932

 
81.53

 
 
 
 

Exercised
(256,910
)
 
31.95

 
 
 
 

Forfeited
(20,966
)
 
69.18

 
 
 
 

Outstanding at December 31, 2014
618,115

 
$
53.10

 
6.0
 
$
31.2

Vested and Expected to Vest at December 31, 2014
600,708

 
$
52.36

 
5.9
 
$
30.8

Exercisable at December 31, 2014
433,793

 
$
44.09

 
4.8
 
$
25.8
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Activity in equity classified awards of restricted stock and restricted stock units for the years ended December 31, 2014, 2013 and 2012 is as follows:
 

Shares of Restricted Stock
 
Weighted
Average
Grant-Date Per
Share
Fair Value
 
Restricted
Stock Units
 
Weighted
Average
Grant-Date
Per Share
Fair Value
Outstanding at December 31, 2011
486,533

 
$
31.08

 
18,000

 
$
29.32

Granted
137,852

 
52.23

 
19,152

 
52.23

Released
(179,465
)
 
13.83

 
(3,910
)
 
40.58

Forfeited
(98,357
)
 
44.40

 
—

 
—

Outstanding at December 31, 2012
346,563

 
44.74

 
33,242

 
41.19

Granted
97,812

 
73.11

 
15,804

 
72.04

Conversion of cash-settled restricted stock units
—

 
—

 
37,184

 
72.28

Released
(117,075
)
 
30.96

 
(39,000
)
 
54.66

Forfeited
(61,048
)
 
55.37

 
—

 
—

Outstanding at December 31, 2013
266,252

 
58.87

 
47,230

 
64.57

Granted
102,618

 
82.18

 
13,879

 
81.65

Released
(94,798
)
 
53.03

 
(19,487
)
 
70.82

Forfeited
(40,254
)
 
67.68

 
—

 
—

Outstanding at December 31, 2014
233,818

 
$
70.14

 
41,622

 
$
66.92
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
Activity in liability classified awards of restricted stock units for the years ended December 31, 2013 and 2012 is as follows:
 
Cash-Settled Restricted Stock Units
 
Weighted
Average
Per Share
Fair Value
Outstanding at December 31, 2011
41,957

 
64.26

Granted
—

 
—

Released
(4,773
)
 
49.66

Outstanding at December 31, 2012
37,184

 
66.13

Conversion to stock-settled restricted stock units
(37,184
)
 
72.28

Outstanding at December 31, 2013
—