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Other Financial Statement Data
3 Months Ended
Mar. 31, 2021
Balance Sheet Related Disclosures [Abstract]  
Other Financial Statement Data Other Financial Statement Data
The following provides additional information concerning selected balance sheet accounts:
March 31, 2021December 31, 2020
Other current assets
Income and other taxes receivable $165.5 $181.4 
Prepaid expenses 89.4 80.4 
Other 68.1 65.1 
$323.0 $326.9 
Other assets
Restricted cash$4.3 $12.3 
MRO inventory135.2 137.7 
Marketable securities held in trust729.9 734.3 
Operating lease right-of-use assets154.4 173.1 
Indemnification asset21.0 23.0 
Long-term receivable46.8 52.6 
Other255.2 255.8 
$1,346.8 $1,388.8 
Accrued liabilities
Payroll and employee benefits $130.7 $195.5 
Asset retirement obligations 188.7 190.2 
Receivable factoring liability86.6 — 
Customer prepayments (a)
352.8 287.6 
Accrued income and other taxes68.6 83.1 
Operating lease obligation61.4 64.0 
Other 392.6 412.7 
$1,281.4 $1,233.1 
Other noncurrent liabilities
Asset retirement obligations $1,182.2 $1,203.7 
Operating lease obligation96.3 109.6 
Accrued pension and postretirement benefits149.7 158.5 
Unrecognized tax benefits 47.6 46.4 
Other 231.4 235.3 
$1,707.2 $1,753.5 
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(a) The timing of recognition of revenue related to our performance obligations may be different than the timing of collection of cash related to those performance obligations. Specifically, we collect prepayments from certain customers in Brazil. In addition, cash collection from Canpotex may occur prior to delivery of product to the end customer. We generally satisfy our contractual liabilities within one quarter of incurring the liability.