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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]  
Schedule of cash equivalents, restricted cash and marketable securities Beginning-of-period and end-of-period cash, cash equivalents, restricted cash and restricted cash equivalents as presented in the statement of cash flows is reconciled as follows:
September 30, 2023December 31, 2022September 30, 2022December 31, 2021
Cash and cash equivalents$157.5 $143.4 $81.4 $29.0 
Restricted cash and marketable securities153.3 127.6 121.7 139.0 
Less: restricted marketable securities(57.0)(56.7)(55.3)(62.4)
Cash, cash equivalents, restricted cash and restricted cash equivalents$253.8 $214.3 $147.8 $105.6 
Summary of restricted cash and marketable securities The following table summarizes our restricted cash and marketable securities:
September 30, 2023December 31, 2022
Capping, closure and post-closure obligations$43.0 $39.1 
Insurance110.3 88.5 
Total restricted cash and marketable securities$153.3 $127.6