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Cash and Marketable Securities - Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 57.4 $ 59.0
Noncurrent restricted cash 64.8 64.3
Affiliate cash    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 16.0 16.4
Self-insured captive funds    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 41.4 42.6
Noncurrent restricted cash $ 7.4 $ 5.3