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Restructuring Charges - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Restructuring and Related Activities [Abstract]        
Restructuring charges $ 17.1 $ 59.6 $ 59.6 $ 0.0