Debt (Details 1) (Recourse, Convertible Subordinated Notes, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Recourse | Convertible Subordinated Notes
Total interest expense recognized on the Convertible Subordinated Notes
Coupon rate interest	$ 17.4	$ 17.4	$ 17.4
Amortized debt discount	13.4	12.3	11.3
Total interest expense recognized on the Convertible Subordinated Notes	$ 30.8	$ 29.7	$ 28.7