Cash and Cash Equivalents	9 Months Ended
	Sep. 30, 2021
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash EquivalentsCash equivalents are short-term, highly liquid investments with insignificant interest rate risk and original maturities of three months or less at acquisition. At September 30, 2021, restricted and designated cash and investments totaled $16.7 million, of which $0.9 million was included in other current assets and $15.8 million was included in other non-current assets in the consolidated balance sheet. Restricted and designated cash and investments totaled $17.3 million at December 31, 2020, of which $1.1 million was included in other current assets and $16.2 million was included in other non-current assets in the consolidated balance sheet. The restricted funds represent deposits required by state agencies for self-insurance purposes and designated funds that are earmarked for a specific purpose and not for general business use.