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Debt (Details 1) (Recourse, Convertible Subordinated Notes, USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Recourse | Convertible Subordinated Notes
       
Total interest expense recognized on the Convertible Subordinated Notes        
Coupon rate interest $ 4.3 $ 4.3 $ 8.7 $ 8.7
Amortized debt discount 3.2 3.0 6.5 6.0
Total interest expense recognized on the Convertible Subordinated Notes $ 7.5 $ 7.3 $ 15.2 $ 14.7