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Other Financial Information (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Cash income taxes paid (collected), net of refunds $ 0.0 $ (0.5)
Interest paid, net of amounts capitalized $ 18.4 $ 14.7