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VPT Loans and Securities - Additional Information (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Jul. 31, 2017
EUR (€)
Sep. 29, 2017
USD ($)
Sep. 30, 2016
USD ($)
Oct. 02, 2015
USD ($)
Jan. 01, 2023
USD ($)
Jul. 31, 2017
EUR (€)
Apr. 30, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Purchase of outstanding senior secured debt     $ 24.5 $ 0.0 $ 0.0      
Investment in available-for-sale securities     13.4 3.3 $ 1.8      
Fair Value     59.8 95.3        
Proton Center, Munich | Loans Receivable                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Purchase of outstanding senior secured debt $ 24.5 € 21.5            
RPTC securities                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Claims filed against all of RPTC's assets | €             € 89.0  
Accounts receivable     4.5 4.8        
RPTC securities | Loans Receivable                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Short-term     $ 25.4 $ 0.0        
DRTC Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair Value               $ 8.0
Stated rate (as a percent)               8.50%
DRTC Loans | Proton International | Senior Subordinated Notes                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Short-term               $ 3.0
Proton International | Public Finance Authority | Senior Subordinated Notes                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Stated rate (as a percent)               8.50%
Financing receivable, net               $ 3.0
Available-for-sale Securities | Georgia Proton Therapy Center                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Maximum lending commitment 16.1              
Investment in available-for-sale securities $ 4.3              
Stated rate (as a percent) 8.00%           8.00%  
Forecast | Available-for-sale Securities | Georgia Proton Therapy Center                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Available-for-sale securities, principal amount           $ 6.6