Stock-Based Compensation - Summary of Information about Outstanding and Exercisable Stock Options (Details) - Non-qualified stock options shares in Millions	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Information about outstanding non-qualified stock options
Exercise price, low end of range (in dollars per share)	$ 7.83
Exercise price, high end of range (in dollars per share)	$ 43.96
Number of Options Outstanding | shares	2.3
Weighted Average Remaining Life	5 years 2 months 12 days
Weighted average exercise price of options Outstanding (in dollars per share)	$ 26.08
Number of Options Exercisable (in shares) | shares	1.8
Weighted average exercise price of options exercisable (in dollars per share)	$ 21.99
Range of exercise prices $7.83 - $19.02
Information about outstanding non-qualified stock options
Exercise price, low end of range (in dollars per share)	7.83
Exercise price, high end of range (in dollars per share)	$ 19.02
Number of Options Outstanding | shares	0.9
Weighted Average Remaining Life	3 years 2 months 27 days
Weighted average exercise price of options Outstanding (in dollars per share)	$ 14.13
Number of Options Exercisable (in shares) | shares	0.8
Weighted average exercise price of options exercisable (in dollars per share)	$ 14.13
Range of exercise prices $20.76 - $28.27
Information about outstanding non-qualified stock options
Exercise price, low end of range (in dollars per share)	20.76
Exercise price, high end of range (in dollars per share)	$ 28.27
Number of Options Outstanding | shares	0.8
Weighted Average Remaining Life	4 years 11 months 1 day
Weighted average exercise price of options Outstanding (in dollars per share)	$ 25.57
Number of Options Exercisable (in shares) | shares	0.8
Weighted average exercise price of options exercisable (in dollars per share)	$ 25.57
Range of exercise prices $41.71 - $43.96
Information about outstanding non-qualified stock options
Exercise price, low end of range (in dollars per share)	41.71
Exercise price, high end of range (in dollars per share)	$ 43.96
Number of Options Outstanding | shares	0.6
Weighted Average Remaining Life	8 years 2 months 19 days
Weighted average exercise price of options Outstanding (in dollars per share)	$ 42.84
Number of Options Exercisable (in shares) | shares	0.2
Weighted average exercise price of options exercisable (in dollars per share)	$ 43.40