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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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, 2018 (in millions):
| 2018 |  | 2017 |  | 2016
Contract drilling | $ | 18.9 |  |  | $ | 18.3 |  |  | $ | 19.9 |
General and administrative | 14.5 |  |  | 14.5 |  |  | 16.6 |
| 33.4 |  |  | 32.8 |  |  | 36.5 |
Tax benefit | (2.8 | ) |  | (4.8 | ) |  | (5.9 | )
Total | $ | 30.6 |  |  | $ | 28.0 |  |  | $ | 30.6 |
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, 2018:
| Share Awards |  | Cash-Settled Awards
| 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Weighted-average grant-date fair value of share awards granted (per share) | $ | 6.16 |  |  | $ | 7.90 |  |  | $ | 10.42 |  |  | $ | 5.31 |  |  | $ | 6.27 |  |  | $ | 9.64 |
Total fair value of share awards vested during the period (in millions) | $ | 7.5 |  |  | $ | 8.6 |  |  | $ | 8.8 |  |  | $ | 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, 2018 (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, 2017 | 3,305 |  |  | $ | 16.06 |  |  | 7,089 |  |  | $ | 7.37 |
Granted | 6,298 |  |  | 6.16 |  |  | 114 |  |  | 5.31 |
Vested | (1,312 | ) |  | 19.85 |  |  | (1,512 | ) |  | 7.53 |
Forfeited | (225 | ) |  | 11.62 |  |  | (574 | ) |  | 7.18 |
Share awards and cash-settled awards as of December 31, 2018 | 8,066 |  |  | $ | 7.84 |  |  | 5,117 |  |  | $ | 7.30 |

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