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Stock and Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Summary of stock-based compensation expense by type of award
The following table summarizes our stock-based compensation expense by type of award (in millions):
 Year Ended December 31,
 202320222021
PRSUs$4.1 $3.4 $1.6 
RSUs9.0 8.0 5.0 
Service options0.7 0.9 1.0 
Market options2.7 4.3 5.6 
Total stock-based compensation expense$16.5 $16.6 $13.2 
PRSUs  
Stock and Stock-Based Compensation Plans  
Summary of PRSU activity
The following table summarizes PRSU activity, including dividend equivalents, under the Omnibus Plan for the year ended December 31, 2023:
Performance-Based Restricted Stock Units
NumberWeighted Average Grant Date Fair Value
PRSUs at January 1, 20231,456,736 $18.24 
Granted540,752 16.09 
Vested— N/A
Forfeited(418,893)22.25 
PRSUs at December 31, 20231,578,595 $16.44 
RSUs  
Stock and Stock-Based Compensation Plans  
Summary of RSU activity
The following table summarizes RSU activity, including dividend equivalents, under the Omnibus Plan for the year ended December 31, 2023:
Restricted Stock UnitsNumberWeighted Average Grant Date Fair Value
RSUs at January 1, 20231,365,882 $14.88 
Granted606,728 14.19 
Vested(544,191)15.56 
Forfeited(78,543)15.23 
RSUs at December 31, 20231,349,876 $14.27 
Service options  
Stock and Stock-Based Compensation Plans  
Summary of option activity
The following table summarizes service option activity under the Omnibus Plan for the year ended December 31, 2023:
Service OptionsNumberWeighted
Average
Exercise
Price
Weighted
Average
Remaining
Contractual
Term
Aggregate
Intrinsic
Value
(in millions)
Outstanding at January 1, 20231,286,097 $14.71  
Granted53,222 14.83  
Exercised(156,752)11.31  
Forfeited— N/A 
Canceled(19,293)14.05  
Outstanding at December 31, 20231,163,274 $15.18 6.1 years$1.1 
Exercisable at December 31, 2023665,409 $14.64 5.0 years$0.9 
Market Options  
Stock and Stock-Based Compensation Plans  
Summary of option activity
The following table summarizes market option activity under the Omnibus Plan for the year ended December 31, 2023:
Market OptionsNumberWeighted
Average
Exercise
Price
Weighted
Average
Remaining
Contractual
Term
Aggregate
Intrinsic
Value
(in millions)
Outstanding at January 1, 20233,557,134 $16.09   
Granted212,886 14.83
Exercised— N/A
Forfeited— N/A
Canceled— N/A
Outstanding at December 31, 20233,770,020 $16.02 7.5 years$1.5 
Exercisable at December 31, 2023— N/AN/AN/A