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Other Financial Statement Data (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Other current assets |  |  |
Income and other taxes receivable | $ 145.1 | $ 179.5 |
Prepaid expenses | 149.0 | 110.7 |
Other | 55.8 | 28.6 |
Total other current assets | 349.9 | 318.8 |
Other assets |  |  |
Restricted cash | 13.9 | 5.4 | $ 8.8
MRO inventory | 129.3 | 126.8 |
Marketable securities held in trust | 726.7 | 691.7 |
Operating Lease, Right-of-Use Asset | 183.7 | 192.1 |
Indemnification asset | 21.4 | 40.6 |
Nontrade Receivables, Noncurrent | 50.0 | 81.6 |
Other | 194.1 | 316.2 |
Total other assets | 1,319.1 | 1,454.4 |
Accrued liabilities |  |  |
Payroll and employee benefits | 171.0 | 173.8 |
Asset retirement obligations | 186.1 | 154.4 |
Customer Funds | 304.4 | 266.9 |
Contractual Obligation For Equity Method Investment | 92.8 | 33.9 |
Operating Lease, Liability, Current | 66.2 | 67.1 |
Other | 408.2 | 385.8 |
Accrued liabilities | 1,228.7 | 1,081.9 |
Other noncurrent liabilities |  |  |
Asset retirement obligations | 1,183.1 | 1,160.8 |
Operating Lease, Liability, Noncurrent | 118.8 | 127.0 |
Accrued pension and postretirement benefits | 137.3 | 173.6 |
Unrecognized tax benefits | 43.6 | 42.1 |
Other | 248.9 | 269.5 |
Total other noncurrent liabilities | $ 1,731.7 | $ 1,773.0 |

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