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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2014 (in millions):
| 2014 |  | 2013 |  | 2012
Contract drilling | $ | 20.9 |  |  | $ | 21.3 |  |  | $ | 17.1 |
General and administrative | 20.7 |  |  | 21.6 |  |  | 24.8 |
Non-vested share award related compensation expense included in operating expenses | 41.6 |  |  | 42.9 |  |  | 41.9 |
Tax benefit | (5.1 | ) |  | (5.4 | ) |  | (7.0 | )
Total non-vested share award related compensation expense included in net income | $ | 36.5 |  |  | $ | 37.5 |  |  | $ | 34.9 |
Summary Of Value Of Non-Vested Share Awards Granted And Vested | The following table summarizes the value of non-vested share awards granted and vested during each of the years in the three-year period ended December 31, 2014:
| 2014 |  | 2013 |  | 2012
Weighted-average grant-date fair value of non-vested share awards granted (per share) | $ | 51.22 |  |  | $ | 59.79 |  |  | $ | 48.32 |
Total fair value of non-vested share awards vested during the period (in millions) | $ | 46.2 |  |  | $ | 49.6 |  |  | $ | 42.5 |
Summary Of Non-Vested Share Award Activity | The following table summarizes non-vested share award activity for the year ended December 31, 2014 (shares in thousands):
| Shares |  | Weighted-Average Grant-Date Fair Value
Non-vested share awards as of December 31, 2013 | 2,496 |  |  | $ | 52.95 |
Granted | 1,242 |  |  | 51.22 |
Vested | (898 | ) |  | 51.07 |
Forfeited | (199 | ) |  | 53.80 |
Non-vested share awards as of December 31, 2014 | 2,641 |  |  | $ | 52.86 |

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