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Other Assets (Tables) | 6 Months Ended
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Jun. 30, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |
Other Assets |
| December 31, |  |  | June 30, |
| 2020 |  |  | 2021 |
| (In millions) |
Other noncurrent assets: |  |  |  |  |  |  |
Land held for development | $ | 96.0 |  |  | $ | 68.5 |
Operating lease right-of-use assets |  | 26.1 |  |  |  | 23.3 |
Restricted cash and cash equivalents |  | 37.8 |  |  |  | 37.7 |
IBNR receivables |  | 37.1 |  |  |  | 32.5 |
Marketable securities |  | 2.9 |  |  |  | 3.0 |
Pension asset |  | 8.4 |  |  |  | 10.3 |
Note receivables - OPA |  | 25.3 |  |  |  | 30.7 |
Other |  | 8.7 |  |  |  | 13.7 |
Total | $ | 242.3 |  |  | $ | 219.7 |

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- Definition Tabular disclosure of noncurrent assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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