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Cash and Marketable Securities - Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 59.0 $ 62.4
Noncurrent restricted cash 64.3 62.4
Affiliate cash [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 16.4 18.1
Self-insured captive funds [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 42.6 44.3
Noncurrent restricted cash $ 5.3 $ 0.0