Employee Benefit Plans, Options Outstanding Exercise Price Range (Details) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in number of shares)	3.6
Weighted Average Remaining Contractual Life (in years)	2 years 1 month 6 days
Weighted Average Exercise (in USD per share)	$ 27.52	$ 24.87	$ 25.15	$ 24.13
Number Exercisable (in number of shares)	3.4
Weighted Average Exercise Price (in USD per share)	$ 28.82
$0.03 - $14.68
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	$ 14.68
Number Outstanding (in number of shares)	0.4
Weighted Average Remaining Contractual Life (in years)	5 years 3 months 18 days
Weighted Average Exercise (in USD per share)	$ 3.38
Number Exercisable (in number of shares)	0.3
Weighted Average Exercise Price (in USD per share)	$ 4.94
$15.09 - $18.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	15.09
Exercise Price Range, Upper Range Limit	$ 18.45
Number Outstanding (in number of shares)	0.4
Weighted Average Remaining Contractual Life (in years)	8 months 12 days
Weighted Average Exercise (in USD per share)	$ 15.58
Number Exercisable (in number of shares)	0.3
Weighted Average Exercise Price (in USD per share)	$ 15.47
$18.49 - $26.10
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	18.49
Exercise Price Range, Upper Range Limit	$ 26.10
Number Outstanding (in number of shares)	0.4
Weighted Average Remaining Contractual Life (in years)	2 years 3 months 18 days
Weighted Average Exercise (in USD per share)	$ 24.11
Number Exercisable (in number of shares)	0.3
Weighted Average Exercise Price (in USD per share)	$ 24.19
$26.39 - $27.44
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	26.39
Exercise Price Range, Upper Range Limit	$ 27.44
Number Outstanding (in number of shares)	0.5
Weighted Average Remaining Contractual Life (in years)	1 year
Weighted Average Exercise (in USD per share)	$ 26.97
Number Exercisable (in number of shares)	0.5
Weighted Average Exercise Price (in USD per share)	$ 26.97
$27.62 - $29.33
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	27.62
Exercise Price Range, Upper Range Limit	$ 29.33
Number Outstanding (in number of shares)	0.1
Weighted Average Remaining Contractual Life (in years)	2 years
Weighted Average Exercise (in USD per share)	$ 28.88
Number Exercisable (in number of shares)	0.1
Weighted Average Exercise Price (in USD per share)	$ 28.88
$29.89 - $29.89
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	29.89
Exercise Price Range, Upper Range Limit	$ 29.89
Number Outstanding (in number of shares)	0.5
Weighted Average Remaining Contractual Life (in years)	1 year 2 months 12 days
Weighted Average Exercise (in USD per share)	$ 29.89
Number Exercisable (in number of shares)	0.5
Weighted Average Exercise Price (in USD per share)	$ 29.89
$30.01 - $36.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	30.01
Exercise Price Range, Upper Range Limit	$ 36.49
Number Outstanding (in number of shares)	0.4
Weighted Average Remaining Contractual Life (in years)	1 year 10 months 24 days
Weighted Average Exercise (in USD per share)	$ 32.76
Number Exercisable (in number of shares)	0.4
Weighted Average Exercise Price (in USD per share)	$ 32.76
$38.93 - $38.93
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	38.93
Exercise Price Range, Upper Range Limit	$ 38.93
Number Outstanding (in number of shares)	0.1
Weighted Average Remaining Contractual Life (in years)	2 years 4 months 24 days
Weighted Average Exercise (in USD per share)	$ 38.93
Number Exercisable (in number of shares)	0.1
Weighted Average Exercise Price (in USD per share)	$ 38.93
$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)	0.5
Weighted Average Remaining Contractual Life (in years)	2 years 2 months 12 days
Weighted Average Exercise (in USD per share)	$ 40.26
Number Exercisable (in number of shares)	0.6
Weighted Average Exercise Price (in USD per share)	$ 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)	0.3
Weighted Average Remaining Contractual Life (in years)	2 years 1 month 6 days
Weighted Average Exercise (in USD per share)	$ 44.00
Number Exercisable (in number of shares)	0.3
Weighted Average Exercise Price (in USD per share)	$ 44.00