Share-Based Payments (Details 5) - Market stock units - USD ($)	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Assumptions used in valuation of market based stock units
Expected dividend yield	0.00%		0.00%	0.00%
Minimum range of risk-free interest rates	0.20%		0.10%	0.10%
Maximum range of risk-free interest rates	1.00%		0.70%	0.70%
Average stock price on grant date minimum	$ 227.35		$ 280.88	$ 150.33
Average stock price on grant date maximum	$ 426.27		$ 335.65	$ 240.14
Weighted average grant date fair value	$ 493.43	[1]	$ 395.22	$ 193.45
Minimum
Assumptions used in valuation of market based stock units
Range of expected stock price volatility	31.00%		31.70%	21.70%
Maximum
Assumptions used in valuation of market based stock units
Range of expected stock price volatility	33.20%		35.10%	25.70%

[1] MSUs granted in 2015 include approximately 8,000, 19,000, 24,000 and 34,000 MSUs issued in 2015 based upon the attainment of performance criteria set for 2014, 2013, 2012 and 2011, respectively, in relation to awards granted in those years. The remainder of MSUs granted during 2015 include awards granted in conjunction with our annual awards made in February 2015 and MSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.