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Acquisitions - Goodwill, Revenue and Pre-Tax (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Acquisitions    
Goodwill for tax purposes $ 28.2 $ 24.3
Revenue 34.2 65.5
Pre-tax income (loss) $ (1.3) $ (3.9)