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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Summary of Significant Accounting Policies [Abstract]

Allowance for Doubtful Accounts Activity

The following table presents our allowance for doubtful accounts activity for the years indicated:

		For the Year Ended December 31,
		2020				2019				2018
Balance at beginning of period		$	12.4			$	11.5			$	12.1
Charged to costs and expenses			8.4				1.2				0.7
Charged to other accounts (1)			28.7				–				–
Deductions			(3.0	)			(0.3	)			(1.3	)
Balance at end of period		$	46.5			$	12.4			$	11.5

(1) Amount presented for 2020 primarily relates to the reclassification of deferred revenue balances to allowance for doubtful accounts 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,
		2020				2019
Cash and cash equivalents		$	1,059.9			$	334.7
Restricted cash			98.2				75.3
Total cash, cash equivalents and restricted cash shown in the    Statements of Consolidated Cash Flows		$	1,158.1			$	410.0

Environmental Reserves Activity

The following table presents the activity of our environmental reserves for the years indicated:

		For the Year Ended December 31,
		2020				2019				2018
Balance at beginning of period		$	7.2			$	6.9			$	11.6
Charged to costs and expenses			6.2				12.3				8.2
Acquisition-related additions and other			2.6				2.5				1.7
Deductions			(11.5	)			(14.5	)			(14.6	)
Balance at end of period		$	4.5			$	7.2			$	6.9

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,
		2020				2019				2018
Impairment charges reflected in operating costs and expenses:
Property, plant and equipment (see Note 4)		$	589.8			$	51.0			$	46.8
Investment in unconsolidated affiliate (see Note 5)			–				76.4				–
Goodwill (see Note 6)			296.3				–				–
Other (1)			4.5				5.3				3.7
Total asset impairment charges in operating costs and expenses			890.6				132.7				50.5
Other property, plant and equipment impairment charges (2)			–				0.1				–
Total asset impairment charges		$	890.6			$	132.8			$	50.5

(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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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=121599337&loc=SL82919249-210447

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