Acquisition of Business Value of Intangible Assets Acquired (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Apr. 30, 2015
Broker Relationships [Member]
Schedule of Intangible Assets Acquired by Class [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	15 years
Minimum [Member]
Schedule of Intangible Assets Acquired by Class [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	2 years
Maximum [Member]
Schedule of Intangible Assets Acquired by Class [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years
Intangible Assets Other Than Intangible Assets Arising from Insurance Contracts Acquired [Member]
Schedule of Intangible Assets Acquired by Class [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 23.6	$ 32.6
Other Intangible Assets [Member]
Schedule of Intangible Assets Acquired by Class [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	3.9	4.5
Broker Relationships [Member]
Schedule of Intangible Assets Acquired by Class [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	18.4	18.9
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Member]
Schedule of Intangible Assets Acquired by Class [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 1.3	$ 9.2