Variable Interest Entities (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	$ 144.3	$ 126.1
Maximum Exposure to Loss	144.3	126.1
Investments in Affiliates [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	143.9	125.5
Maximum Exposure to Loss	143.9	125.5
Other investment [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	0.4	0.6
Maximum Exposure to Loss	$ 0.4	$ 0.6