Summary of Significant Accounting Policies Summary of Foreign currency losses, net of hedging additional details (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Foreign Currency [Abstract]
Foreign Currency Transaction Gain (Loss), Realized	$ 5.1	$ 3.3	$ 3.8