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Cash, Cash Equivalents and Restricted Cash (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Restricted cash included in other current assets $ 0.2 $ 0.2
Restricted cash included in other long-term assets 5.7 5.7
Workers compensation financial assurance [Member]    
Restricted cash included in other long-term assets $ 5.4 $ 5.4