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Acquisitions Acquisition - Ability Re (Details) - USD ($)
$ in Millions
6 Months Ended
Nov. 03, 2014
Mar. 31, 2015
Oct. 31, 2014
Ability Re [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities     $ 0.1
Payments to Acquire Businesses, Gross $ 17.9    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     8.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Funds Withheld     359.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     368.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves     346.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other     1.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     348.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Assets Less Goodwill     $ 19.2
Business Combination, Consideration Transferred $ 19.2    
Shaser [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross   $ (1.5)  
Business Combination, Consideration Transferred, Other   $ 2.8