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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-Based Compensation Expense by Type of Award
Total stock-based compensation expense (benefit) by type of award was as follows:
 
Year Ended
 
One month ended
 
December 31,
 
December 31,
 
November 30,
 
December 31,
 
2017
 
2016
 
2015
 
2015
 
(In millions)
SARs
$
9.3

 
$
2.2

 
$
1.8

 
$
(1.4
)
Restricted stock, service based
4.1

 
3.6

 
5.6

 
0.3

Restricted stock, performance based
6.8

 
5.7

 
0.1

 
0.6

Employee stock purchase plan ("ESPP")
0.6

 
0.5

 
0.3

 
—

Stock options
1.2

 
0.9

 
0.8

 
0.1

Total stock-based compensation expense (benefit)
$
22.0

 
$
12.9

 
$
8.6

 
$
(0.4
)
Summary of Stock Appreciation Rights
A summary of the status of the Company’s SARs as of December 31, 2017 and changes during fiscal 2017:
 
SARs
(In millions) 
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Aggregate
Intrinsic
Value
(In millions) 
Outstanding at December 31, 2016
1.0

 
$
11.52

 
 
 
 
Granted
0.4

 
22.35

 
 
 
 
Exercised
(0.3
)
 
6.97

 
 
 
 
Canceled
(0.1
)
 
17.21

 
 
 
 
Outstanding at December 31, 2017
1.0

 
$
16.62

 
4.7
 
$
14.6

Exercisable at December 31, 2017
0.2

 
$
8.17

 
1.2
 
$
5.4
Summary of Restricted Stock Units
A summary of the status of the Company’s service-based restricted stock as of December 31, 2017 and changes during fiscal 2017:
 
Service
Based
Restricted
Stock
(In millions)  
 
Weighted
Average
Grant Date
Fair Value 
Outstanding at December 31, 2016
0.6

 
$
18.06

Granted
0.1

 
24.98

Exercised
(0.3
)
 
18.12

Outstanding at December 31, 2017
0.4

 
$
20.14

Expected to vest at December 31, 2017
0.4

 
$
20.14

A summary of the status of the Company’s performance-based restricted stock as of December 31, 2017 and changes during fiscal 2017:
 
Performance
Based
Restricted
Stock
(In millions)
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2016
1.1

 
$
17.85

Granted
0.5

 
22.35

Exercised
(0.3
)
 
15.80

Canceled
(0.3
)
 
18.48

Outstanding at December 31, 2017
1.0

 
$
19.73

Expected to vest at December 31, 2017
0.6

 
$
19.74
Schedule of Stock Options Activity
A summary of the status of the Company’s stock options as of December 31, 2017 and changes during fiscal 2017:
 
Stock
Options
(In millions) 
 
Weighted
Average
Exercise
Price 
 
Weighted
Average
Remaining
Contractual
Life (years) 
 
Intrinsic
Value
(In millions) 
Outstanding at December 31, 2016
0.6

 
$
15.48

 
 
 
 
Exercised
(0.2
)
 
6.54

 
 
 
 
Outstanding at December 31, 2017
0.4

 
$
18.86

 
4.6
 
$
5.1

Exercisable at December 31, 2017
0.3

 
$
17.09

 
4.8
 
$
4.1

Expected to vest at December 31, 2017
0.1

 
$
23.06

 
4.2
 
$
1.0
Summary of Range of Exercise Prices and Weighted-Average Exercise Prices for Options Outstanding
The following table summarizes the range of exercise prices and weighted-average exercise prices for options outstanding as of December 31, 2017 under the Company’s stock option plans:
 
 
 
 
Outstanding
Period
Granted
 
Range of Exercise Prices
 
Stock
Options
Outstanding
(In millions) 
 
Weighted
Average
Exercise
Price 
 
Weighted
Average
Remaining
Contractual
Life (years) 
Fiscal 2015
 
$20.48 - $23.06
 
0.2

 
$
23.03

 
4.2
Fiscal 2016
 
$18.01
 
0.2

 
$
18.01

 
5.6
 
 
 
 
0.4

 
 
 
 
Schedule of Weighted Average Assumptions Used to Determine Fair Value of Stock Awards
The fair value of SARs was estimated using a Black-Scholes Model with the following weighted average assumptions:
 
Year Ended
 
One month ended
 
December 31,
 
December 31,
 
November 30,
 
December 31,
 
2017
 
2016
 
2015
 
2015
Expected life (in years)
4.8

 
4.0

 
2.1

 
2.0

Volatility
34.00
%
 
36.00
%
 
34.00
%
 
34.00
%
Risk-free interest rate
2.23
%
 
1.65
%
 
0.94
%
 
0.79
%
The Company used the following weighted average assumptions to value the awards for the year ended December 31, 2016:
 
Performance- based common shares
 
Performance-based stock options
Expected life (in years)
1.04

 
0.99

Volatility
32.97
%
 
39.58
%
Risk-free interest rate
1.17
%
 
1.43
%
The fair value of stock options was estimated using a Black-Scholes Model (except for the performance-based stock options discussed in the section above) with the following weighted average assumptions:
 
Year ended
 
November 30,
 
2015
Expected life (in years)
7.0

Volatility
58.06
%
Risk-free interest rate
1.94
%