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Other Financial Information (Summary Of Changes In Operating Working Capital) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Accounts receivable $ 4.9 $ (33.4) $ 86.6
Inventories (51.7) (6.1) (39.0)
Prepaid expenses and other current assets 16.6 (3.3) 11.4
Accounts payable and accrued liabilities 8.3 (5.9) (56.7)
Income taxes payable 8.8 0.0 0.0
Net decrease (increase) in noncash operating working capital $ (13.1) $ (48.7) $ 2.3