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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary Of Non-Vested Share Award Related Compensation Expense Recognized | The following table summarizes non-vested share award related compensation expense recognized during each of the years in the three-year period ended December 31, 2015 (in millions):
| 2015 |  | 2014 |  | 2013
Contract drilling | $ | 19.5 |  |  | $ | 20.9 |  |  | $ | 21.3 |
General and administrative | 17.8 |  |  | 20.7 |  |  | 21.6 |
Non-vested share award related compensation expense included in operating expenses | 37.3 |  |  | 41.6 |  |  | 42.9 |
Tax benefit | (4.8 | ) |  | (5.1 | ) |  | (5.4 | )
Total non-vested share award related compensation expense included in net income | $ | 32.5 |  |  | $ | 36.5 |  |  | $ | 37.5 |
Summary Of Value Of Non-Vested Share Awards Granted And Vested | The following table summarizes the value of non-vested shares granted and vested during each of the years in the three-year period ended December 31, 2015:
| 2015 |  | 2014 |  | 2013
Weighted-average grant-date fair value of non-vested share awards granted (per share) | $ | 23.95 |  |  | $ | 51.22 |  |  | $ | 59.79 |
Total fair value of non-vested share awards vested during the period (in millions) | $ | 18.0 |  |  | $ | 46.2 |  |  | $ | 49.6 |
Summary Of Non-Vested Share Award Activity | The following table summarizes non-vested share activity for the year ended December 31, 2015 (shares in thousands):
| Shares |  | Weighted-Average Grant-Date Fair Value
Non-vested share awards as of December 31, 2014 | 2,641 |  |  | $ | 52.86 |
Granted | 2,116 |  |  | 23.95 |
Vested | (787 | ) |  | 51.42 |
Forfeited | (827 | ) |  | 41.23 |
Non-vested share awards as of December 31, 2015 | 3,143 |  |  | $ | 36.46 |

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