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Accounting Policies - Allowance for Credit Loss (Details) - USD ($)
$ in Millions
 6 Months Ended
Jan. 01, 2020
Jun. 30, 2020
Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 0.5 $ 0.5  
Impact from Adoption of ASC 326 0.6    
Current Period Provision   1.6  
Ending balance 1.1 2.7  
Allowance for doubtful accounts 1.1 2.7 $ 2.7
Financing receivable, credit loss, expense (reversal)   1.6  
Accounts receivable, allowance for credit loss     1.2
Level 1      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Current Period Provision   0.4  
Financing receivable, credit loss, expense (reversal)   0.4  
Accounts Receivable      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 0.5 0.5  
Ending balance   1.7  
Allowance for doubtful accounts $ 0.5 0.5 1.7
Restricted Investment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance   1.0  
Allowance for doubtful accounts   $ 1.0 $ 1.0