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Discontinued Operations and Special (Gains) Charges - Narrative (Details) - Discontinued Operations - Disposed of by Sale - NATG - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Benefit from settlements of payable accounts $ 1.8   $ 2.3  
Operating expense 0.4   0.4  
Tax effect of discontinued operation 0.5 $ 0.5 3.4 $ 0.5
Restitution receipts   1.9 15.0 1.9
Vendor settlements   0.1 0.1 0.1
Ongoing restitution proceedings     3.0  
Professional fees   $ 0.4   $ 0.5
Maximum        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Additional charges (less than) $ 0.5   $ 0.5