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Restructuring Charges - Summary of Restructuring Reserve (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Reserve [Roll Forward]          
Beginning balance       $ 0.0  
Expenses $ 0.0 $ 3.6 $ 0.0 3.6 $ 0.0
Payments       (1.5)  
Ending balance $ 2.1     $ 2.1