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Fair Value Measurements - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Level 1 to level 2 transfers $ 0   $ 0     $ 0
Equity securities 100,000   100,000     400,000
Realized gains 0 $ 0 (100,000)      
Equity securities, unrealized gain (loss) 0 $ 0 0 $ 0    
Equity Securities without readily determinable fair value 0   0     1,500,000
Impairment losses 100,000   1,400,000      
Debt Securities, held-to-maturity, restricted 72,500,000   72,500,000      
Held-to-maturity, allowance for credit loss 1,000,000.0   1,000,000.0      
Restricted cash 1,200,000   1,200,000      
Restricted investments, at fair value 79,300,000   79,300,000      
Long-term debt, gross 1,336,300,000   1,336,300,000     $ 1,257,800,000
Contingent consideration liability         $ 7,000,000.0  
Variable Interest Rate            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term debt, gross 956,300,000   956,300,000      
Senior Notes            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term debt, gross 300,000,000.0   300,000,000.0      
Debt instrument, fair value 296,600,000   296,600,000      
Reported Value Measurement            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Finance lease obligations 80,000,000.0   80,000,000.0      
Estimate of Fair Value Measurement            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Finance lease obligations $ 102,600,000   $ 102,600,000