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Commitments and Contingencies - Restricted Cash and Marketable Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Restricted Cash and Marketable Securities [Abstract]        
Financing proceeds $ 0.0 $ 38.6    
Capping, closure and post-closure obligations 29.2 28.6    
Insurance 69.9 71.4    
Other 0.0 2.5    
Total restricted cash and marketable securities $ 99.1 $ 141.1 $ 96.4 $ 90.5