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Other Financial Information (Summary of Changes in Operating Working Capital) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts receivable $ (6.0) $ (8.9)
Inventories (32.6) (47.4)
Prepaid expenses and other current assets 17.1 11.5
Accounts payable and accrued liabilities 5.7 (25.1)
Income taxes payable 0.0 11.6
Net (increase) decrease in noncash operating working capital $ (15.8) $ (58.3)