Variable Interest Entities (Details 1) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	$ 153.7	$ 144.3
Maximum Exposure to Loss	153.7	144.3
Investments in Affiliates [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	153.4	143.9
Maximum Exposure to Loss	153.4	143.9
Other investment [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	0.3	0.4
Maximum Exposure to Loss	$ 0.3	$ 0.4