Employee Benefit Plans, Options Outstanding Exercise Price Range (Details) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	$ 0.03
Exercise Price Range, Upper Range Limit (in USD per share)	$ 44
Number Outstanding (in number of shares)	2.4
Weighted Average Remaining Contractual Life (in years)	1 year 6 months 20 days
Weighted Average Exercise (in USD per share)	$ 29.20	$ 27.52	$ 24.87	$ 25.15
Number Exercisable (in number of shares)	2.3
Weighted Average Exercise Price (in USD per share)	$ 29.95
$0.03 - $18.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	0.03
Exercise Price Range, Upper Range Limit (in USD per share)	$ 18.45
Number Outstanding (in number of shares)	0.4
Weighted Average Remaining Contractual Life (in years)	5 years 5 months 2 days
Weighted Average Exercise (in USD per share)	$ 4.60
Number Exercisable (in number of shares)	0.3
Weighted Average Exercise Price (in USD per share)	$ 4.05
$19.73 - $27.44
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	19.73
Exercise Price Range, Upper Range Limit (in USD per share)	$ 27.44
Number Outstanding (in number of shares)	0.3
Weighted Average Remaining Contractual Life (in years)	10 months 28 days
Weighted Average Exercise (in USD per share)	$ 25.58
Number Exercisable (in number of shares)	0.3
Weighted Average Exercise Price (in USD per share)	$ 25.58
$29.33 - $29.33
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	29.33
Exercise Price Range, Upper Range Limit (in USD per share)	$ 29.33
Number Outstanding (in number of shares)	0.0
Weighted Average Remaining Contractual Life (in years)	1 year 5 months 16 days
Weighted Average Exercise (in USD per share)	$ 29.33
Number Exercisable (in number of shares)	0.0
Weighted Average Exercise Price (in USD per share)	$ 29.33
$29.89 - $29.89
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	29.89
Exercise Price Range, Upper Range Limit (in USD per share)	$ 29.89
Number Outstanding (in number of shares)	0.6
Weighted Average Remaining Contractual Life (in years)	2 months 16 days
Weighted Average Exercise (in USD per share)	$ 29.89
Number Exercisable (in number of shares)	0.6
Weighted Average Exercise Price (in USD per share)	$ 29.89
$30.01 - $31.94
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	30.01
Exercise Price Range, Upper Range Limit (in USD per share)	$ 31.94
Number Outstanding (in number of shares)	0.2
Weighted Average Remaining Contractual Life (in years)	10 months 18 days
Weighted Average Exercise (in USD per share)	$ 30.60
Number Exercisable (in number of shares)	0.2
Weighted Average Exercise Price (in USD per share)	$ 30.60
$34.73 - $34.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	34.73
Exercise Price Range, Upper Range Limit (in USD per share)	$ 34.73
Number Outstanding (in number of shares)	0.1
Weighted Average Remaining Contractual Life (in years)	10 months 7 days
Weighted Average Exercise (in USD per share)	$ 34.73
Number Exercisable (in number of shares)	0.1
Weighted Average Exercise Price (in USD per share)	$ 34.73
$36.49 - $36.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	36.49
Exercise Price Range, Upper Range Limit (in USD per share)	$ 36.49
Number Outstanding (in number of shares)	0.0
Weighted Average Remaining Contractual Life (in years)	11 months 16 days
Weighted Average Exercise (in USD per share)	$ 36.49
Number Exercisable (in number of shares)	0.0
Weighted Average Exercise Price (in USD per share)	$ 36.49
$38.93 - $38.93
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	38.93
Exercise Price Range, Upper Range Limit (in USD per share)	$ 38.93
Number Outstanding (in number of shares)	0.1
Weighted Average Remaining Contractual Life (in years)	1 year 4 months 17 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 (in USD per share)	40.26
Exercise Price Range, Upper Range Limit (in USD per share)	$ 40.26
Number Outstanding (in number of shares)	0.5
Weighted Average Remaining Contractual Life (in years)	1 year 2 months 16 days
Weighted Average Exercise (in USD per share)	$ 40.26
Number Exercisable (in number of shares)	0.5
Weighted Average Exercise Price (in USD per share)	$ 40.26
$44.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in USD per share)	44
Exercise Price Range, Upper Range Limit (in USD per share)	$ 44
Number Outstanding (in number of shares)	0.2
Weighted Average Remaining Contractual Life (in years)	1 year 1 month 17 days
Weighted Average Exercise (in USD per share)	$ 44.00
Number Exercisable (in number of shares)	0.2
Weighted Average Exercise Price (in USD per share)	$ 44.00