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Fair Value Measurements - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
authorization
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Payments to acquire equity method investments       $ 62.8 $ 16.5    
Unfunded commitments $ 6.8     $ 6.8      
Unfunded commitments term       10 years      
Debt securities, held-to-maturity, restricted 77.5     $ 77.5   $ 76.1  
Held-to-maturity, allowance for credit loss 0.6     0.6   0.5  
Restricted investment, restricted cash 6.4     6.4   4.7  
Restricted investments, at fair value 73.5     73.5   80.0  
Total debt including finance lease obligations 1,160.8     $ 1,160.8   $ 1,280.5  
Earn out period       5 years   5 years  
Privately Held Companies              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Number of strategic investments acquired | authorization       2      
Payments to acquire equity method investments 60.0 $ 2.0          
Equity securities where fair value is not readily determinable 80.8     $ 80.8   $ 18.8  
Privately Held Company              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Payments to acquire equity method investments     $ 16.5        
Carrying value of strategic equity investment 14.5     14.5   16.5  
Venture Capital Fund              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Payments to acquire equity method investments 0.8            
Carrying value of strategic equity investment 0.8     0.8      
2020 Acquisitions              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Contingent consideration             $ 7.0
Liability              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Revenue Earn-out consideration 0.8     0.8   0.8 $ 0.8
Debt Obligations              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Finance lease obligations 101.8     101.8   102.4  
Variable Interest Rate              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Total debt including finance lease obligations 509.0     509.0   328.1  
Senior Notes Issued 2018              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Senior notes 550.0     550.0   850.0  
Senior Notes Issued 2018 | Level 2              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Debt instrument, fair value 452.4     452.4   843.9  
Estimate of Fair Value Measurement | Debt Obligations              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Finance lease obligations $ 107.1     $ 107.1   $ 118.6