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Property, Plant and Equipment and Intangible Assets - Schedule of Carrying Amounts of Assets and Liabilities Held for Sale (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Current assets:    
Property, plant and equipment, net of accumulated depreciation and estimated loss on sale $ 61.0  
Other current assets 1.2  
Total assets held for sale 62.2 $ 137.7
Current liabilities:    
Accounts payable and accrued liabilities 1.0  
Other long-term obligations 2.6  
Total liabilities held for sale $ 3.6 $ 6.4