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Other Financial Information (Summary of Changes in Operating Working Capital) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts receivable $ (5.3) $ 37.3
Inventories 20.5 (16.7)
Prepaid expenses and other current assets (3.3) 13.7
Accounts payable and accrued liabilities 81.6 (66.1)
Income taxes payable 14.5 6.1
Net (increase) decrease in noncash operating working capital $ 108.0 $ (25.7)