Variable Interest Entities (Details 1) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	$ 148.9	$ 144.3
Maximum Exposure to Loss	148.9	144.3
Investments in Affiliates [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	148.5	143.9
Maximum Exposure to Loss	148.5	143.9
Other investment [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	0.4	0.4
Maximum Exposure to Loss	$ 0.4	$ 0.4