Stock-Based Compensation (Details 3) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y
Options and SARs outstanding
Number of Shares	7,029
Weighted Average Remaining Contractual Life (in years)	6.03
Weighted Average Exercise Price (in dollars per share)	$ 18.01
Expected to vest
Number of shares expected to vest	6,764
Weighted Average Remaining Contractual Life (in years)	5.91
Weighted Average Exercise Price (in dollars per share)	$ 17.73
Stock options and SARs exercisable
Number Exercisable (in shares)	4,355
Weighted Average Exercise Price (in dollars per share)	$ 14.65
Aggregate intrinsic value of options and SARs expected to vest	$ 48.0
$6.96 - $9.08
Options and SARs outstanding
Number of Shares	844
Weighted Average Remaining Contractual Life (in years)	2.40
Weighted Average Exercise Price (in dollars per share)	$ 8.94
Stock options and SARs exercisable
Number Exercisable (in shares)	844
Weighted Average Exercise Price (in dollars per share)	$ 8.94
$6.96 - $9.08 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 9.08
$6.96 - $9.08 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 6.96
$9.13 - $10.38
Options and SARs outstanding
Number of Shares	804
Weighted Average Remaining Contractual Life (in years)	2.42
Weighted Average Exercise Price (in dollars per share)	$ 9.54
Stock options and SARs exercisable
Number Exercisable (in shares)	804
Weighted Average Exercise Price (in dollars per share)	$ 9.54
$9.13 - $10.38 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 10.38
$9.13 - $10.38 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 9.13
$10.47 - $14.18
Options and SARs outstanding
Number of Shares	755
Weighted Average Remaining Contractual Life (in years)	4.60
Weighted Average Exercise Price (in dollars per share)	$ 13.49
Stock options and SARs exercisable
Number Exercisable (in shares)	700
Weighted Average Exercise Price (in dollars per share)	$ 13.67
$10.47 - $14.18 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 14.18
$10.47 - $14.18 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 10.47
$14.53 - $16.21
Options and SARs outstanding
Number of Shares	753
Weighted Average Remaining Contractual Life (in years)	6.93
Weighted Average Exercise Price (in dollars per share)	$ 16.05
Stock options and SARs exercisable
Number Exercisable (in shares)	478
Weighted Average Exercise Price (in dollars per share)	$ 16.02
$14.53 - $16.21 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 16.21
$14.53 - $16.21 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 14.53
$16.30 - $19.79
Options and SARs outstanding
Number of Shares	710
Weighted Average Remaining Contractual Life (in years)	5.62
Weighted Average Exercise Price (in dollars per share)	$ 18.17
Stock options and SARs exercisable
Number Exercisable (in shares)	594
Weighted Average Exercise Price (in dollars per share)	$ 18.12
$16.30 - $19.79 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 19.79
$16.30 - $19.79 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 16.30
$19.94 - $21.34
Options and SARs outstanding
Number of Shares	611
Weighted Average Remaining Contractual Life (in years)	6.52
Weighted Average Exercise Price (in dollars per share)	$ 20.85
Stock options and SARs exercisable
Number Exercisable (in shares)	403
Weighted Average Exercise Price (in dollars per share)	$ 20.85
$19.94 - $21.34 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 21.34
$19.94 - $21.34 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 19.94
$21.75 - $21.75
Options and SARs outstanding
Number of Shares	733
Weighted Average Remaining Contractual Life (in years)	8.14
Weighted Average Exercise Price (in dollars per share)	$ 21.75
Stock options and SARs exercisable
Number Exercisable (in shares)	264
Weighted Average Exercise Price (in dollars per share)	$ 21.75
$21.75 - $21.75 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 21.75
$21.75 - $21.75 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 21.75
$21.90 - $26.85
Options and SARs outstanding
Number of Shares	681
Weighted Average Remaining Contractual Life (in years)	7.74
Weighted Average Exercise Price (in dollars per share)	$ 24.74
Stock options and SARs exercisable
Number Exercisable (in shares)	253
Weighted Average Exercise Price (in dollars per share)	$ 23.86
$21.90 - $26.85 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 26.85
$21.90 - $26.85 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 21.90
$26.91 - $26.91
Options and SARs outstanding
Number of Shares	1,016
Weighted Average Remaining Contractual Life (in years)	9.26
Weighted Average Exercise Price (in dollars per share)	$ 26.91
Stock options and SARs exercisable
Number Exercisable (in shares)	13
Weighted Average Exercise Price (in dollars per share)	$ 26.91
$26.91 - $26.91 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 26.91
$26.91 - $26.91 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 26.91
$27.02 - $30.15
Options and SARs outstanding
Number of Shares	122
Weighted Average Remaining Contractual Life (in years)	9.24
Weighted Average Exercise Price (in dollars per share)	$ 27.64
Stock options and SARs exercisable
Number Exercisable (in shares)	2
Weighted Average Exercise Price (in dollars per share)	$ 27.02
$27.02 - $30.15 | Maximum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 30.15
$27.02 - $30.15 | Minimum
Options and SARs outstanding
Exercise Price (in dollars per share)	$ 27.02