Variable Interest Entities (Details) - Variable Interest Entity, Primary Beneficiary [Member] - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Noncontrolling Interest in Variable Interest Entity	$ 52.0	$ 58.4
Variable Interest Entity, Consolidated, Carrying Amount, Assets	135.9	139.9
New Ocean Capital Management Ltd [Member]
Variable Interest Entity [Line Items]
Noncontrolling Interest in Variable Interest Entity	$ 0.2	$ 0.2