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Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                  
Downsizing costs $ 0.8   $ 0.8   $ 0.4 $ 0.8 $ 0.8    
Legal fees 2.4 $ 3.5 0.9     $ 1.5      
Claim settlement reserves   2.6 0.7            
Acquisition and merger related expenses $ 0.7   $ 2.6 $ 1.4       $ 3.6 $ 0.9
Discrete tax expense (benefit) due to Tax Reform Legislation   $ (5.8)   $ 28.2       $ (5.8) $ 28.2
Discrete tax charges         $ 1.0