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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary Of Non-Vested Share Award Related Compensation Expense Recognized | The following table summarizes share award and cash-settled award compensation expense recognized during each of the years in the three-year period ended December 31, 2019 (in millions):
| 2019 |  | 2018 |  | 2017
Contract drilling | $ | 22.1 |  |  | $ | 18.9 |  |  | $ | 18.3 |
General and administrative | 17.4 |  |  | 14.5 |  |  | 14.5 |
| 39.5 |  |  | 33.4 |  |  | 32.8 |
Tax benefit | (2.5 | ) |  | (2.8 | ) |  | (4.8 | )
Total | $ | 37.0 |  |  | $ | 30.6 |  |  | $ | 28.0 |
Summary Of Value Of Non-Vested Share Awards Granted And Vested | The following table summarizes the value of share awards and cash-settled awards granted and vested during each of the years in the three-year period ended December 31, 2019:
| Share Awards |  | Cash-Settled Awards
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Weighted-average grant-date fair value of share awards granted (per share) | $ | 11.50 |  |  | $ | 24.62 |  |  | $ | 31.48 |  |  | $ | — |  |  | $ | 21.35 |  |  | $ | 25.08 |
Total fair value of share awards vested during the period (in millions) | $ | 17.7 |  |  | $ | 7.5 |  |  | $ | 8.2 |  |  | $ | 3.5 |  |  | $ | 9.9 |  |  | $ | 3.9 |
Summary Of Non-Vested Share Award Activity | The following table summarizes share awards and cash-settled awards activity for the year ended December 31, 2019 (shares in thousands):
| Share Awards |  | Cash-settled Awards
| Awards |  | Weighted-Average Grant-Date Fair Value |  | Awards |  | Weighted-Average Grant-Date Fair Value
Share awards and cash-settled awards as of December 31, 2018 | 2,017 |  |  | $ | 31.36 |  |  | 1,279 |  |  | $ | 29.20 |
Granted | 4,460 |  |  | 11.50 |  |  | — |  |  | — |
Rowan share awards assumed | 2,329 |  |  | 15.88 |  |  | — |  |  | — |
Vested | (1,519 | ) |  | 10.53 |  |  | (453 | ) |  | 7.97 |
Forfeited | (854 | ) |  | 8.87 |  |  | (129 | ) |  | 11.58 |
Share awards and cash-settled awards as of December 31, 2019 | 6,433 |  |  | $ | 19.89 |  |  | 697 |  |  | $ | 46.28 |

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