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Cash and Marketable Securities - Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 31.6	$ 62.5
Noncurrent restricted cash	31.6	62.9
Affiliate cash
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	12.9	14.7
Self-insured captive funds
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	17.3	47.8
Noncurrent restricted cash	0.0	0.4
Other
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 1.4	$ 0.0

X

- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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