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Marketable Securities Held in Trusts (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Debt Securities, Available-for-sale

The estimated fair value of the investments in the RCRA Trusts as of December 31, 2021 and December 31, 2020 are as follows:

			December 31, 2021
(in millions)			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Level 1
Cash and cash equivalents			$	8.1					$	—					$	—					$	8.1
Level 2
Corporate debt securities			198.8						5.6						(0.9)						203.5
Municipal bonds			198.1						6.5						(0.5)						204.1
U.S. government bonds			305.3						—						(6.1)						299.2
Total			$	710.3					$	12.1					$	(7.5)					$	714.9
			December 31, 2020
(in millions)			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Level 1
Cash and cash equivalents			$	11.8					$	—					$	—					$	11.8
Level 2
Corporate debt securities			193.3						14.0						—						207.3
Municipal bonds			190.5						8.8						(0.3)						199.0
U.S. government bonds			300.7						4.7						(0.1)						305.3
Total			$	696.3					$	27.5					$	(0.4)					$	723.4

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following tables show gross unrealized losses and fair values of the RCRA Trusts’ available-for-sale securities that have been in a continuous unrealized loss position for which an allowance for credit losses has not been recorded as of December 31, 2021 and December 31, 2020.

			December 31, 2021												December 31, 2020
Securities that have been in a continuous loss position for less than 12 months (in millions):			Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses
Corporate debt securities			$	67.1					$	(0.8)					$	1.5					$	—
Municipal bonds			39.9						(0.4)						16.0						(0.2)
U.S. government bonds			152.2						(2.5)						120.3						(0.1)
Total			$	259.2					$	(3.7)					$	137.8					$	(0.3)
			December 31, 2021												December 31, 2020
Securities that have been in a continuous loss position for more than 12 months (in millions):			Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses
Corporate debt securities			$	3.6					$	(0.1)					$	—					$	—
Municipal bonds			4.5						(0.1)						4.6						(0.1)
U.S. government bonds			143.4						(3.6)						—						—
Total			$	151.5					$	(3.8)					$	4.6					$	(0.1)

Schedule of maturity dates for debt securities

The following table summarizes the balance by contractual maturity of the available-for-sale debt securities invested by the RCRA Trusts as of December 31, 2021. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations before the underlying contracts mature.

(in millions)			December 31, 2021
Due in one year or less			$	26.4
Due after one year through five years			351.9
Due after five years through ten years			293.9
Due after ten years			34.6
Total debt securities			$	706.8

X

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-URI http://asc.fasb.org/topic&trid=2196928

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Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 6
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455

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