Debt (Details 1) - Corporate - Recourse - Convertible subordinated notes - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Total interest expense recognized on the Convertible Subordinated Notes
Coupon rate interest	$ 4.3	$ 4.3	$ 8.7	$ 8.7
Amortized debt discount	3.9	3.6	7.7	7.1
Total interest expense recognized on the Convertible Subordinated Notes	$ 8.2	$ 7.9	$ 16.4	$ 15.8