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Stock-based Compensation (Tables) | 12 Months Ended
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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) | 2020 |  | 2019 |  | 2018
PRSU expense | $ | 77.4 |  |  | $ | 1.4 |  |  | $ | 2.5 |
Stock option expense | 4.9 |  |  | 4.9 |  |  | 6.7 |
RSU/DSU expense | 22.2 |  |  | 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) | Shares |  | Weighted Average Grant Date Fair Value
Awards unvested at December 31, 2018 | 8.0 |  |  | $ | 15.27 |
Granted | 0.3 |  |  | 21.35 |
Vested | — |  |  | — |
Forfeited | (4.8) |  |  | 17.74 |
Awards unvested at December 31, 2019 | 3.5 |  |  | 15.02 |
Granted | 3.5 |  |  | 21.39 |
Vested | (3.4) |  |  | 15.03 |
Forfeited | — |  |  | — |
Awards unvested at December 31, 2020 | 3.6 |  |  | $ | 21.18 |
Schedule of Stock Options Valuation Assumptions |
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Expected volatility range of stock | N/A |  | N/A |  | 39.8% - 40.1%
Expected life of option, range in years | N/A |  | N/A |  | 5
Risk-free interest range rate | N/A |  | N/A |  | 2.2% - 2.8%
Expected dividend yield on stock | N/A |  | N/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) | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Options outstanding at December 31, 2018 | 6.4 |  |  | $ | 15.63 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (1.2) |  |  | 13.12 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Options outstanding at December 31, 2019 | 5.2 |  |  | $ | 16.30 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (0.5) |  |  | 13.03 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Options outstanding at December 31, 2020 | 4.7 |  |  | $ | 16.69 |  |  | 5.59 |  | 47.7 |
Options exercisable at December 31, 2020 | 3.6 |  |  | $ | 16.78 |  |  | 5.32 |  | 36.3 |
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) | Shares |  | Weighted Average Grant Date Fair Value
Options unvested at December 31, 2018 | 2.4 |  |  | $ | 16.55 |
Granted | — |  |  | — |
Vested | (0.4) |  |  | 16.67 |
Forfeited | — |  |  | — |
Options unvested at December 31, 2019 | 2.0 |  |  | $ | 16.50 |
Granted | — |  |  | — |
Vested | (0.9) |  |  | 16.67 |
Forfeited | — |  |  | — |
Options unvested at December 31, 2020 | 1.1 |  |  | $ | 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) | Shares |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
Awards outstanding at December 31, 2018 | 3.3 |  |  | $ | 15.96 |  |  |
Granted | 2.7 |  |  | 10.77 |  |  |
Vested | (0.9) |  |  | 15.64 |  |  |
Terminated | — |  |  | — |  |  |
Awards outstanding at December 31, 2019 | 5.1 |  |  | $ | 13.24 |  |  | $ | 110.3 |
Granted | 0.8 |  |  | 20.81 |  |  |
Vested | (1.6) |  |  | 13.43 |  |  |
Terminated | (0.1) |  |  | 13.99 |  |  |
Awards outstanding at December 31, 2020 | 4.2 |  |  | $ | 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, 2020 |  | Weighted Average Remaining Vesting Period (Years)
Unrecognized stock option expense | $ | 1.6 |  |  | 1
Unrecognized DSU/RSU expense | 30.4 |  |  | 2.19
Unrecognized PRSU expense | 47.1 |  |  | 2.12
Total unrecognized stock-based compensation expense | $ | 79.1 |  |  | 2.12

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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