Variable Interest Entities (Details) (Variable Interest Entity, Primary Beneficiary [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
New Ocean Capital Management Ltd [Member]
Variable Interest Entity [Line Items]
Noncontrolling Interest in Variable Interest Entity	$ 0.01	$ 0.30
New Ocean Focus Cat Fund [Member]
Variable Interest Entity [Line Items]
Noncontrolling Interest in Variable Interest Entity	35.20	6.90
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 96.5	$ 46.5