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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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 impact of all stock-based compensation expense on our Consolidated Statements of Income for the years ended December 31, 2017, 2016 and 2015.
(in millions of dollars)
2017
 
2016
 
2015
Selling, general and administrative expense
$
17.0

 
$
19.4

 
$
16.0

Loss before income tax
(17.0
)
 
(19.4
)
 
(16.0
)
Income tax benefit
(6.1
)
 
(7.0
)
 
(5.7
)
Net loss
$
(10.9
)
 
$
(12.4
)
 
$
(10.3
)
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
Stock-based compensation expense by award type for the years ended December 31, 2017, 2016 and 2015 was as follows:
(in millions of dollars)
2017
 
2016
 
2015
Stock option compensation expense
$
2.4

 
$
2.9

 
$
3.9

RSU compensation expense
4.3

 
4.5

 
4.7

PSU compensation expense
10.3

 
12.0

 
7.4

Total stock-based compensation expense
$
17.0

 
$
19.4

 
$
16.0
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model and the weighted average assumptions as outlined in the following table:
 
Year Ended December 31,
 
2017
 
2015
Weighted average expected lives
4.8

years
 
4.5

years
Weighted average risk-free interest rate
2.04

%
 
1.47

%
Weighted average expected volatility
39.7

%
 
46.5

%
Expected dividend yield
0.0

%
 
0.0

%
Weighted average grant date fair value
$
4.70

 
 
$
3.00

 
Summary of Changes in Stock Options and SSARs
A summary of the changes in stock options outstanding under the Plan during the year ended December 31, 2017 is presented below:
 
Number
Outstanding
 
Weighted
Average
Exercise
Price
 
Weighted  Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2016
4,133,874

 
$
7.82

 
 
 
 
Granted
745,772

 
$
12.75

 
 
 
 
Exercised
(547,107
)
 
$
7.72

 
 
 
 
Forfeited
(59,888
)
 
$
9.57

 
 
 
 
Outstanding at December 31, 2017
4,272,651

 
$
8.68

 
3.3 years
 
$
15.5
 million
Exercisable shares at December 31, 2017
3,157,606

 
$
7.88

 
2.6 years
 
$
13.6
 million
Summary of Changes in RSUs Outstanding
A summary of the changes in the RSUs outstanding under the Plan during 2017 is presented below:
 
Stock
Units
 
Weighted
Average
Grant
Date Fair
Value
Outstanding at December 31, 2016
1,910,669

 
$
7.23

Granted
438,521

 
$
12.65

Vested and distributed
(691,319
)
 
$
6.21

Vested and deferred distributed
(38,042
)
 
$
9.46

Forfeited and cancelled
(85,771
)
 
$
8.66

Outstanding at December 31, 2017
1,534,058

 
$
9.10

Vested and deferred at December 31, 2017(1)
326,835

 
$
9.16

(1)
Included in outstanding at December 31, 2017. Vested and deferred RSUs are primarily related to deferred compensation for non-employee directors.
Summary of Changes in PSUs Outstanding
A summary of the changes in the PSUs outstanding under the Plan during 2017 is presented below:
 
Stock
Units
 
Weighted
Average
Grant
Date Fair
Value
Outstanding at December 31, 2016
4,281,792

 
$
7.09

Granted
706,732

 
$
12.75

Vested
(1,502,327
)
 
$
6.16

Forfeited and cancelled
(131,465
)
 
$
8.24

Other - increase due to performance of PSU's
176,580

 
$
11.72

Outstanding at December 31, 2017
3,531,312

 
$
8.82