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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Summary of restricted cash and marketable securities The following table summarizes our restricted cash and marketable securities:
June 30, 2019December 31, 2018
Capping, closure and post-closure obligations$30.1 $29.5 
Insurance89.1 78.6 
Total restricted cash and marketable securities$119.2 $108.1 
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, 2019December 31, 2018June 30, 2018December 31, 2017
Cash and cash equivalents$72.5 $70.5 $61.3 $83.3 
Restricted cash and marketable securities119.2 108.1 116.2 141.1 
Less: restricted marketable securities(48.0)(45.3)(44.8)(45.3)
Cash, cash equivalents, restricted cash and restricted cash equivalents$143.7 $133.3 $132.7 $179.1