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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [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, 2019, 2018 and 2017:
(in millions)
2019
 
2018
 
2017
Selling, general and administrative expense
$
10.1

 
$
8.8

 
$
17.0

Loss before income tax
(10.1
)
 
(8.8
)
 
(17.0
)
Income tax benefit
(2.4
)
 
(2.2
)
 
(6.1
)
Net loss
$
(7.7
)
 
$
(6.6
)
 
$
(10.9
)
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, 2019, 2018 and 2017 was as follows:
(in millions)
2019
 
2018
 
2017
Stock option compensation expense
$
2.7

 
$
2.0

 
$
2.4

RSU compensation expense
5.1

 
4.7

 
4.3

PSU compensation expense
2.3

 
2.1

 
10.3

Total stock-based compensation expense
$
10.1

 
$
8.8

 
$
17.0
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The fair value of each option award 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,
 
2019
 
2018
 
2017
Weighted average expected lives
4.6

years
 
4.8

years
 
4.8

years
Weighted average risk-free interest rate
2.49

%
 
2.62

%
 
2.04

%
Weighted average expected volatility
36.1

%
 
36.4

%
 
39.7

%
Expected dividend yield
2.65

%
 
1.87

%
 
0.00

%
Weighted average grant date fair value
$
2.40

 
 
$
3.76

 
 
$
4.70

 
Summary of Changes in Stock Options Outstanding
A summary of the changes in stock options outstanding under the Plan during the year ended December 31, 2019 is presented below:
 
Number
Outstanding
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at December 31, 2018
4,125,067

 
$
9.46

 
 
 
 
Granted
1,303,255

 
$
9.05

 
 
 
 
Exercised
(559,371
)
 
$
7.54

 
 
 
 
Forfeited
(451,258
)
 
$
12.01

 
 
 
 
Outstanding at December 31, 2019
4,417,693

 
$
9.32

 
3.9 years
 
$
4.8
 million
Exercisable shares at December 31, 2019
2,468,344

 
$
8.53

 
2.4 years
 
$
4.4
 million
Summary of Changes in RSUs Outstanding
A summary of the changes in the RSUs outstanding under the Plan during 2019 is presented below:
 
Stock
Units
 
Weighted Average Grant Date Fair Value
Outstanding at December 31, 2018
1,446,634

 
$
10.72

Granted
679,601

 
$
8.74

Vested and distributed
(362,165
)
 
$
7.74

Forfeited and cancelled
(47,625
)
 
$
11.81

Outstanding at December 31, 2019
1,716,445

 
$
10.53

Vested and deferred at December 31, 2019(1)
512,525

 
$
9.37

(1)
Included in outstanding at December 31, 2019. 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 2019 is presented below:
 
Stock
Units
 
Weighted Average Grant Date Fair Value
Outstanding at December 31, 2018
1,604,394

 
$
9.46

Granted
895,389

 
$
8.35

Vested
(1,059,825
)
 
$
7.66

Forfeited and cancelled
(34,384
)
 
$
11.27

Other - decrease due to performance of PSUs
(384,031
)
 
$
10.32

Outstanding at December 31, 2019
1,021,543

 
$
9.98