Debt (Details 1) (Recourse, Convertible Subordinated Notes, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Recourse | Convertible Subordinated Notes
Total interest expense recognized on the Convertible Subordinated Notes
Coupon rate interest	$ 4.4	$ 4.4	$ 13.1	$ 13.1
Amortized debt discount	3.4	3.1	9.9	9.1
Total interest expense recognized on the Convertible Subordinated Notes	$ 7.8	$ 7.5	$ 23.0	$ 22.2