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Business Segment Reporting - Schedule of Segment Reporting Information (Footnote) (Details) - Corporate and Other [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]          
Severance expense $ (0.1)   $ 0.3 $ 19.1 $ 7.5
Recovery of professional services expense   $ 30.7