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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2024
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:
March 31, 2024December 31, 2023March 31, 2023December 31, 2022
Cash and cash equivalents$91.6 $140.0 $132.2 $143.4 
Restricted cash and marketable securities143.3 163.6 132.7 127.6 
Less: restricted marketable securities(76.5)(76.1)(58.2)(56.7)
Cash, cash equivalents, restricted cash and restricted cash equivalents$158.4 $227.5 $206.7 $214.3 
Summary of restricted cash and marketable securities
The following table summarizes our restricted cash and marketable securities:
March 31, 2024December 31, 2023
Capping, closure and post-closure obligations$43.7 $43.2 
Insurance99.6 120.4 
Total restricted cash and marketable securities$143.3 $163.6