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Discontinued Operations and Assets and Liabilities Held for Sale (Assets and Liabilities Held For Sale) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]      
Cash and cash equivalents $ 0.7 $ 0.0 $ 3.7
Held-for-sale      
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]      
Inventories 2.6 0.0  
Property, Plant & Equipment (net) 9.2 22.6  
Cash and cash equivalents 0.7 0.0  
Other assets 1.4 0.0  
Held for sale assets 13.9 22.6  
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract]      
Accounts payable 0.5 0.0  
Other liabilities 1.8 0.0  
Held for sale liabilities $ 2.3 $ 0.0