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Stock-Based Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2015
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,
 
2015
 
2014
 
2013
 
(In millions)
Total stock-based compensation expense:
 
 
 
 
 
Equity classified awards expense
$
9.0

 
$
9.4

 
$
9.4

Liability classified awards (credit) expense
(0.4
)
 
2.4

 
0.9

Total pre-tax stock-based compensation expense
8.6

 
11.8

 
10.3

Book income tax benefit
(3.3
)
 
(4.5
)
 
(3.9
)
Total stock-based compensation expense, net of tax
$
5.3

 
$
7.3

 
$
6.4
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:
 
2015
 
2014
 
2013
Risk free interest rate
1.5
%
 
1.6
%
 
0.8
%
Weighted average historical volatility
36.8
%
 
51.1
%
 
83.4
%
Dividend yield
3.2
%
 
3.7
%
 
4.2
%
Expected years until exercise
4.5

 
4.6

 
4.6

Weighted average fair value of options granted
$
27.20

 
$
26.87

 
$
36.00
Schedule of Share-based Compensation, Stock Options, Activity
Stock option activity for the years ended December 31, 2015, 2014 and 2013 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, 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

 
 
 
 

Granted
133,814

 
111.54

 
 
 
 

Exercised
(218,412
)
 
43.66

 
 
 
 

Forfeited
(29,055
)
 
99.97

 
 
 
 

Outstanding at December 31, 2015
504,462

 
$
69.99

 
6.7
 
$
10.5

Vested and Expected to Vest at December 31, 2015
485,616

 
$
68.71

 
6.7
 
$
10.5

Exercisable at December 31, 2015
310,543

 
$
52.56

 
5.5
 
$
10.1
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, 2015, 2014 and 2013 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, 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

Granted
138,518

 
102.78

 
10,630

 
111.72

Released
(77,042
)
 
54.89

 
(16,567
)
 
52.19

Forfeited
(37,700
)
 
86.77

 
(569
)
 
101.55

Outstanding at December 31, 2015
257,594

 
$
89.99

 
35,116

 
$
86.30