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Share-Based Compensation (Details) (Restricted share awards and share unit awards [Member], USD $)
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3 Months Ended | 6 Months Ended |
|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2014
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Restricted share awards and share unit awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Awards granted | 900,000 | 1,100,000 |
| Vesting rate | 20.00% | |
| Vesting rate for certain officers and non-employee directors | 33.00% | |
| Weighted-average grant-date fair value of non-vested awards | $ 52.47 | $ 52.51 |