Fair Value Measurements Fair Value Measurements, Textual (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014 Minimum	Sep. 30, 2014 Maximum	Sep. 30, 2014 Derivative	Dec. 31, 2013 Derivative
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Net Asset (Liability)			$ (0.7)	$ (4.3)
Short-term investment maturity period	34 days	18 months