Debt (Details 1) (Corporate, Recourse, Convertible subordinated notes, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Corporate | 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	3.7	3.4	10.8	9.9
Total interest expense recognized on the Convertible Subordinated Notes	$ 8.1	$ 7.8	$ 23.9	$ 23.0