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Other Financial Information (Tables)
 9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Changes in Operating Working Capital
 
Nine Months Ended
September 30,
(Millions of dollars)
2018
 
2017
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
—

 
11.6

Net (increase) decrease in noncash operating working capital
$
(15.8
)
 
$
(58.3
)