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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense
The Company's stock-based compensation expense for the year ended December 31, 2020 included PRSUs, stock options, RSUs and DSUs. A summary of the Company’s stock-based compensation expense is presented below:
Year Ended December 31,
(in millions)202020192018
PRSU expense$77.4 $1.4 $2.5 
Stock option expense4.9 4.9 6.7 
RSU/DSU expense22.2 20.5 15.6 
Total stock-based compensation expense$104.5 $26.8 $24.8 
Summary of PRSU Activity and Related Information A summary of the Company's PRSU activity and related information for the years ended December 31, 2020 and 2019 is presented below:
(shares in millions)SharesWeighted Average Grant Date Fair Value
Awards unvested at December 31, 20188.0 $15.27 
Granted0.3 21.35 
Vested— — 
Forfeited(4.8)17.74 
Awards unvested at December 31, 20193.5 15.02 
Granted 3.5 21.39 
Vested (3.4)15.03 
Forfeited— — 
Awards unvested at December 31, 20203.6 $21.18 
Schedule of Stock Options Valuation Assumptions
Year Ended December 31,
202020192018
Expected volatility range of stockN/AN/A
39.8% - 40.1%
Expected life of option, range in yearsN/AN/A5
Risk-free interest range rateN/AN/A
2.2% - 2.8%
Expected dividend yield on stockN/AN/A—%
Schedule of Stock Option Activity
A summary of the Company's stock option activity under the 2003 Plan and 2013 Plan for the years ended December 31, 2020 and 2019 is presented below:
(in millions, except per share amounts and years)SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Term (Years)Aggregate Intrinsic Value
Options outstanding at December 31, 20186.4 $15.63 
Granted— — 
Exercised(1.2)13.12 
Forfeited— — 
Options outstanding at December 31, 20195.2 $16.30 
Granted— — 
Exercised(0.5)13.03 
Forfeited— — 
Options outstanding at December 31, 20204.7 $16.69 5.5947.7 
Options exercisable at December 31, 20203.6 $16.78 5.3236.3 
A summary of the Company's unvested shares relating to stock options as of December 31, 2020 and 2019, and changes during the years ended December 31, 2020 and 2019, are presented below:
(shares in millions)SharesWeighted Average Grant Date Fair Value
Options unvested at December 31, 20182.4 $16.55 
Granted— — 
Vested(0.4)16.67 
Forfeited— — 
Options unvested at December 31, 20192.0 $16.50 
Granted— — 
Vested(0.9)16.67 
Forfeited— — 
Options unvested at December 31, 20201.1 $16.38 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of the Company's RSU and DSU activity and related information for the years ended December 31, 2020 and 2019 is presented below:
(in millions, except per share amounts)SharesWeighted Average Grant Date Fair ValueAggregate Intrinsic Value
Awards outstanding at December 31, 20183.3 $15.96 
Granted2.7 10.77 
Vested(0.9)15.64 
Terminated— — 
Awards outstanding at December 31, 20195.1 $13.24 $110.3 
Granted0.8 20.81 
Vested(1.6)13.43 
Terminated(0.1)13.99 
Awards outstanding at December 31, 20204.2 $14.57 $113.6 
Schedule of Unrecognized Compensation Expense summary of total unrecognized stock-based compensation expense based on current performance estimates related to stock options, DSUs, RSUs and PRSUs for the year ended December 31, 2020 is presented below:
(in millions, except years)December 31, 2020Weighted Average Remaining Vesting Period (Years)
Unrecognized stock option expense$1.6 1
Unrecognized DSU/RSU expense30.4 2.19
Unrecognized PRSU expense47.1 2.12
Total unrecognized stock-based compensation expense$79.1 2.12