Share-Based Incentive Plan (Stock Awards) (Details)	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares under stock awards, outstanding at beginning of period | shares	7,732,499
Weighted average exercise price per share, outstanding at beginning of period | $ / shares	$ 31.85
Number of shares under stock awards, granted | shares	780,254
Weighted average exercise price per share, granted | $ / shares	$ 46.15
Number of shares under stock awards, exercised | shares	(496,440)
Weighted average exercise price per share, exercised | $ / shares	$ 23.52
Number of shares under stock awards, forfeited | shares	(166,571)
Weighted average exercise price per share, forfeited | $ / shares	$ 51.26
Number of shares under stock awards, outstanding at end of period | shares	7,849,742
Weighted average exercise price per share, outstanding at end of period | $ / shares	$ 33.39
Number of shares under stock awards, vested and expected to vest at end of period | shares	7,537,727
Weighted average exercise price per share, vested and expected to vest at end of period | $ / shares	$ 32.78
Number of shares under stock awards, options exercisable at end of period | shares	5,704,835
Weighted average exercise price per share, options exercisable at end of period | $ / shares	$ 27.71