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Acquisition and Disposals - Allied - Acquisition Consideration (Narrative) (Details) - Allied International Holdings, Inc. - USD ($)
$ in Millions
Mar. 31, 2017
Feb. 01, 2016
Jun. 30, 2017
Apr. 11, 2017
Business Acquisition [Line Items]        
Cash consideration   $ 75.7    
Measurement period   3 years    
Contingent consideration liability   $ 15.0 $ 17.0  
Total acquisition consideration   90.7    
Contingent consideration, low end of range       $ 12.5
Contingent consideration, high end of range       $ 20.0
Change in estimate of contingent considaration $ 2.0      
Fair value of net assets acquired and liabilities assumed   76.7    
Indefinite-lived intangible assets acquired during the period   8.0    
Definite lived intangible assets acquired   6.0    
Goodwill acquired during the period   14.1    
Insurance Segment        
Business Acquisition [Line Items]        
Goodwill acquired during the period   $ 14.1