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Benefit Plans (Tables)
 12 Months Ended
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