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Significant Accounting Policies and Practices (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
partnership
variable_interest_entity
voting_interest_model_entity
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Significant Accounting Policies and Practices            
Restricted cash and cash equivalents $ 0.2   $ 0.2   $ 0.5  
Allowance for doubtful accounts 5.0   $ 5.0   1.9 $ 1.0
Number of ownership interest entities | partnership     29      
Equity earnings in related investments 0.2 $ 0.9 $ 0.8 $ 1.6    
Deferred tax assets increased     32.4      
Deferred tax assets $ 43.0   $ 43.0   $ 10.6  
Minimum            
Significant Accounting Policies and Practices            
Ownership interests percentage 30.00%   30.00%      
Maximum            
Significant Accounting Policies and Practices            
Ownership interests percentage 50.00%   50.00%      
Primary Beneficiary            
Significant Accounting Policies and Practices            
Number of ownership interest entities | variable_interest_entity     24      
Not Primary Beneficiary            
Significant Accounting Policies and Practices            
Number of ownership interest entities | voting_interest_model_entity     5