Stock-Based Compensation (Details 9) (Stock Appreciation Rights [Member], USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Stock Appreciation Rights [Member]
Schedule of information on stock units
Outstanding awards, beginning of period	1.8
Outstanding, Weighted-Average Exercise Price per Share, beginning of period	$ 45.58	$ 56.20
Granted	0.2
Granted, Weighted-Average Excercise Price per Share	$ 92.64
Exercised	(0.5)
Exercised, Weighted-Average Exercise Price per Share	$ 35.91
Forfeited	0
Forfeited, Weighted-Average Exercise Price per Share	$ 0.00
Outstanding awards, end of period	1.5
Exercisable at end of year, shares	1.0
Exercisable at end of year, Weighted-Average Exercise Price per Share	$ 43.65