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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)

X

- Definition

The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

+ References

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-Section 45
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- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes.

+ References

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-Publisher FASB
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- Definition

The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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Amount of increase (decrease) in prepaid expenses, and assets classified as other.

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