Employee Benefit Plans, Options Outstanding Exercise Price Range (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in number of shares)	9.9
Weighted Average Remaining Contractual Life (in years)	2 years
Weighted Average Exercise (in dollars)	$ 24.87	$ 25.15	$ 24.13	$ 23.98
Number Exercisable (in number of shares)	9.1
Weighted Average Exercise Price (in dollars)	$ 25.88
$0.03 - $15.09
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 0.03
Exercise Price Range, Upper Range Limit	$ 15.09
Number Outstanding (in number of shares)	1.7
Weighted Average Remaining Contractual Life (in years)	3 years 7 months 6 days
Weighted Average Exercise (in dollars)	$ 9.58
Number Exercisable (in number of shares)	1.3
Weighted Average Exercise Price (in dollars)	$ 12.23
$16.39 - $22.59
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 16.00
Exercise Price Range, Upper Range Limit	$ 21.12
Number Outstanding (in number of shares)	1.4
Weighted Average Remaining Contractual Life (in years)	1 year 6 months
Weighted Average Exercise (in dollars)	$ 20.36
Number Exercisable (in number of shares)	1.2
Weighted Average Exercise Price (in dollars)	$ 20.34
$22.74 - $24.61
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 21.43
Exercise Price Range, Upper Range Limit	$ 23.84
Number Outstanding (in number of shares)	1.1
Weighted Average Remaining Contractual Life (in years)	2 years
Weighted Average Exercise (in dollars)	$ 23.85
Number Exercisable (in number of shares)	0.9
Weighted Average Exercise Price (in dollars)	$ 23.81
$24.73 - $24.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 23.89
Exercise Price Range, Upper Range Limit	$ 24.20
Number Outstanding (in number of shares)	0.1
Weighted Average Remaining Contractual Life (in years)	4 months 24 days
Weighted Average Exercise (in dollars)	$ 24.73
Number Exercisable (in number of shares)	0.1
Weighted Average Exercise Price (in dollars)	$ 24.73
$25.16- $25.16
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 24.25
Exercise Price Range, Upper Range Limit	$ 25.49
Number Outstanding (in number of shares)	1.2
Weighted Average Remaining Contractual Life (in years)	2 months 12 days
Weighted Average Exercise (in dollars)	$ 25.16
Number Exercisable (in number of shares)	1.2
Weighted Average Exercise Price (in dollars)	$ 25.16
$25.19 - $26.90
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 25.50
Exercise Price Range, Upper Range Limit	$ 26.90
Number Outstanding (in number of shares)	1.0
Weighted Average Remaining Contractual Life (in years)	1 year 3 months 18 days
Weighted Average Exercise (in dollars)	$ 26.24
Number Exercisable (in number of shares)	1.0
Weighted Average Exercise Price (in dollars)	$ 26.24
$26.97 - $29.89
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 26.97
Exercise Price Range, Upper Range Limit	$ 29.89
Number Outstanding (in number of shares)	1.6
Weighted Average Remaining Contractual Life (in years)	1 year 9 months 18 days
Weighted Average Exercise (in dollars)	$ 28.71
Number Exercisable (in number of shares)	1.6
Weighted Average Exercise Price (in dollars)	$ 28.70
$30.01 - $38.93
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 29.93
Exercise Price Range, Upper Range Limit	$ 38.93
Number Outstanding (in number of shares)	0.7
Weighted Average Remaining Contractual Life (in years)	2 years 10 months 24 days
Weighted Average Exercise (in dollars)	$ 33.57
Number Exercisable (in number of shares)	0.7
Weighted Average Exercise Price (in dollars)	$ 33.60
$40.26 - $40.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 40.26
Exercise Price Range, Upper Range Limit	$ 40.26
Number Outstanding (in number of shares)	0.7
Weighted Average Remaining Contractual Life (in years)	2 years 9 months 18 days
Weighted Average Exercise (in dollars)	$ 40.26
Number Exercisable (in number of shares)	0.7
Weighted Average Exercise Price (in dollars)	$ 40.26
$44.00 - $44.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 44.00
Exercise Price Range, Upper Range Limit	$ 44.00
Number Outstanding (in number of shares)	0.4
Weighted Average Remaining Contractual Life (in years)	3 years
Weighted Average Exercise (in dollars)	$ 44.00
Number Exercisable (in number of shares)	0.4
Weighted Average Exercise Price (in dollars)	$ 44.00