Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Entity	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Wholly-owned bankruptcy remote special-purpose corporations	4
Interest expense net of interest income on bank deposits	$ 1.2	$ 1.9	$ 0.7
Total operating lease expense	$ 134.0	$ 133.3	$ 137.3