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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2022
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:
June 30, 2022December 31, 2021June 30, 2021December 31, 2020
Cash and cash equivalents$119.4 $29.0 $34.0 $38.2 
Restricted cash and marketable securities121.5 139.0 151.0 149.1 
Less: restricted marketable securities(57.2)(62.4)(73.0)(73.1)
Cash, cash equivalents, restricted cash and restricted cash equivalents$183.7 $105.6 $112.0 $114.2 
Summary of restricted cash and marketable securities The following table summarizes our restricted cash and marketable securities:
June 30, 2022December 31, 2021
Financing proceeds$2.0 $12.4 
Capping, closure and post-closure obligations38.3 42.4 
Insurance81.2 84.2 
Total restricted cash and marketable securities$121.5 $139.0