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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Share-based compensation expense | Share-based compensation expense and cash flow amounts were as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (Dollars in millions)
Share-based compensation expense | $ | 13.5 |  |  | $ | 38.3 |  |  | $ | 34.9 |
Tax benefit | — |  |  | — |  |  | — |
Share-based compensation expense, net of tax benefit | $ | 13.5 |  |  | $ | 38.3 |  |  | $ | 34.9 |
Cash received upon the exercise of stock options | — |  |  | — |  |  | — |
Write-off tax benefits related to share-based compensation | — |  |  | — |  |  | — |
Schedule of Share-based Compensation, Restricted Stock Units Activity | A summary of restricted stock unit activity is as follows:
| Year Ended December 31, 2020 |  | Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2019 | 1,706,025 |  |  | $ | 26.89 |
Granted | 1,706,907 |  |  | 9.71 |
Vested | (1,105,979) |  |  | 24.37 |
Forfeited | (676,997) |  |  | 16.38 |
Nonvested at December 31, 2020 | 1,629,956 |  |  | $ | 14.49 |
Schedule of Performance Units Activity | A summary of performance unit activity is as follows:
| Year Ended December 31, 2020 |  | Weighted Average Remaining Contractual Life
Nonvested at December 31, 2019 | 426,606 |  |  | 1.6 |
Granted | 686,082 |  |  |
Vested | — |  |  |
Forfeited | (254,100) |  |  |
Nonvested at December 31, 2020 | 858,588 |  |  | 1.5 |
Schedule of Share-based Payment Award, Performance Units, Valuation Assumptions | The assumptions used in the valuations for grants were as follows:
| Year Ended December 31,
| 2020 |  | 2019
Risk-free interest rate | 1.45 | % |  | 2.44 | %
Expected volatility | 49.34 | % |  | 48.81 | %
Dividend yield | — | % |  | — | %

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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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