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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Summary of Significant Accounting Policies [Abstract] |
Allowance for Credit Losses | The following table presents our allowance for credit losses activity for the years indicated:
|  | For the Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Balance at beginning of period |  | $ | 46.5 |  |  | $ | 12.4 |  |  | $ | 11.5 |
Charged to costs and expenses |  |  | 7.2 |  |  |  | 8.4 |  |  |  | 1.2 |
Charged to other accounts (1) |  |  | 4.4 |  |  |  | 28.7 |  |  |  | – |
Deductions |  |  | (5.4 | ) |  |  | (3.0 | ) |  |  | (0.3 | )
Balance at end of period |  | $ | 52.7 |  |  | $ | 46.5 |  |  | $ | 12.4 |
(1) | Amount presented for 2020 primarily relates to the reclassification of deferred revenue balances to allowance for credit losses in connection with customer bankruptcies and contractual disputes.
Cash, Cash Equivalents and Restricted Cash | The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the amounts shown in the Statements of Consolidated Cash Flows.
|  | December 31, |
|  | 2021 |  |  | 2020 |
Cash and cash equivalents |  | $ | 2,819.4 |  |  | $ | 1,059.9 |
Restricted cash |  |  | 145.3 |  |  |  | 98.2 |
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows |  | $ | 2,964.7 |  |  | $ | 1,158.1 |
Environmental Reserves Activity | The following table presents the activity of our environmental reserves for the years indicated:
|  | For the Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Balance at beginning of period |  | $ | 4.5 |  |  | $ | 7.2 |  |  | $ | 6.9 |
Charged to costs and expenses |  |  | 5.5 |  |  |  | 6.2 |  |  |  | 12.3 |
Acquisition-related additions and other |  |  | 1.3 |  |  |  | 2.6 |  |  |  | 2.5 |
Deductions |  |  | (7.6 | ) |  |  | (11.5 | ) |  |  | (14.5 | )
Balance at end of period |  | $ | 3.7 |  |  | $ | 4.5 |  |  | $ | 7.2 |
Asset Impairment Charges | The following table summarizes our asset impairment charges by type as presented on our Statements of Consolidated Cash Flows for the years indicated:
|  | For the Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Impairment charges reflected in operating costs and expenses: |  |  |  |  |  |  |  |  |
Property, plant and equipment (see Note 4) |  | $ | 217.7 |  |  | $ | 589.8 |  |  | $ | 51.0 |
Investment in unconsolidated affiliate (see Note 5) |  |  | – |  |  |  | – |  |  |  | 76.4 |
Goodwill (see Note 6) |  |  | – |  |  |  | 296.3 |  |  |  | – |
Other (1) |  |  | 14.9 |  |  |  | 4.5 |  |  |  | 5.3 |
Total asset impairment charges in operating costs and expenses |  |  | 232.6 |  |  |  | 890.6 |  |  |  | 132.7 |
Other property, plant and equipment impairment charges (2) |  |  | 0.2 |  |  |  | – |  |  |  | 0.1 |
Total asset impairment charges |  | $ | 232.8 |  |  | $ | 890.6 |  |  | $ | 132.8 |
(1) | Primarily represents the write-down of surplus materials classified as current assets and intangible assets other than goodwill.
(2) | Amounts presented are reflected in general and administrative costs.

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- Definition Tabular disclosure of material changes in the expected aggregate amount of environmental loss contingencies since the prior balance sheet date. This element may be used for an entity's entire roll forward of environmental loss contingencies. + References No definition available. + Details
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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition The entire disclosure for the details of the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Disclosure may also include a description of the impaired asset and facts and circumstances leading to the impairment, amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired asset is reported. + References No definition available. + Details
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