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Stock-Based Compensation Plans (Exercise Price Range) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Shares (in shares) | shares 10,495,039
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 21.67
Options Outstanding - Weighted-average remaining contractual life 4 years 11 months 8 days
Options Exercisable - Shares (in shares) | shares 6,690,250
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 25.57
Options Exercisable - Weighted-average remaining contractual life 2 years 9 months 14 days
$13.11 - $14.26  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of per share exercise prices, lower range (in dollars per share) $ 13.11
Range of per share exercise prices, upper range (in dollars per share) $ 14.26
Options Outstanding - Shares (in shares) | shares 2,653,510
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 13.17
Options Outstanding - Weighted-average remaining contractual life 8 years 11 months 8 days
Options Exercisable - Shares (in shares) | shares 100,000
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 13.39
Options Exercisable - Weighted-average remaining contractual life 4 years 11 months 1 day
$14.27 - $21.89  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of per share exercise prices, lower range (in dollars per share) $ 14.27
Range of per share exercise prices, upper range (in dollars per share) $ 21.89
Options Outstanding - Shares (in shares) | shares 2,347,595
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 17.07
Options Outstanding - Weighted-average remaining contractual life 7 years 1 month 27 days
Options Exercisable - Shares (in shares) | shares 1,296,316
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 17.22
Options Exercisable - Weighted-average remaining contractual life 6 years 4 months 20 days
$21.90 - $24.77  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of per share exercise prices, lower range (in dollars per share) $ 21.90
Range of per share exercise prices, upper range (in dollars per share) $ 24.77
Options Outstanding - Shares (in shares) | shares 2,683,597
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 23.29
Options Outstanding - Weighted-average remaining contractual life 2 years 3 months 25 days
Options Exercisable - Shares (in shares) | shares 2,683,597
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 23.29
Options Exercisable - Weighted-average remaining contractual life 2 years 3 months 25 days
$24.78 - $36.96  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of per share exercise prices, lower range (in dollars per share) $ 24.78
Range of per share exercise prices, upper range (in dollars per share) $ 36.96
Options Outstanding - Shares (in shares) | shares 2,810,337
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 31.98
Options Outstanding - Weighted-average remaining contractual life 1 year 9 months 18 days
Options Exercisable - Shares (in shares) | shares 2,610,337
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 32.53
Options Exercisable - Weighted-average remaining contractual life 1 year 3 months 29 days