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, 2015 $ / 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 4 months 21 days
Weighted average exercise price of options Outstanding (in dollars per share)	$ 23.75
Number of Options Exercisable (in shares) | shares	1.8
Weighted average exercise price of options exercisable (in dollars per share)	$ 19.83
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	1.0
Weighted Average Remaining Life	3 years 9 months 11 days
Weighted average exercise price of options Outstanding (in dollars per share)	$ 14.75
Number of Options Exercisable (in shares) | shares	1.0
Weighted average exercise price of options exercisable (in dollars per share)	$ 14.75
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	0.9
Weighted Average Remaining Life	5 years 9 months 26 days
Weighted average exercise price of options Outstanding (in dollars per share)	$ 25.42
Number of Options Exercisable (in shares) | shares	0.7
Weighted average exercise price of options exercisable (in dollars per share)	$ 25.02
Range of exercise prices $43.01 - $43.96
Information about outstanding non-qualified stock options
Exercise price, low end of range (in dollars per share)	43.01
Exercise price, high end of range (in dollars per share)	$ 43.96
Number of Options Outstanding | shares	0.4
Weighted Average Remaining Life	8 years 7 months 28 days
Weighted average exercise price of options Outstanding (in dollars per share)	$ 43.57
Number of Options Exercisable (in shares) | shares	0.1
Weighted average exercise price of options exercisable (in dollars per share)	$ 43.01