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Debt Obligations - Schedule of Debt (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Aug. 08, 2023
Dec. 31, 2022
Dec. 31, 2021
Feb. 01, 2021
Debt Instrument [Line Items]          
Obligations under finance leases $ 2.5   $ 2.1    
Total aggregate finance lease and debt payments 756.8   725.3    
Unamortized issuance discount, issuance premium, and deferred financing costs (7.2)   (10.9)    
Less: current portion of debt obligations (162.8)   (30.6)    
Debt obligations 586.8   683.8    
Infrastructure          
Debt Instrument [Line Items]          
Obligations under finance leases 2.5   2.1    
Total aggregate finance lease and debt payments 232.8   243.0    
Infrastructure | PRIME minus 0.85% Line of Credit due 2024 | Real Estate Term Advance          
Debt Instrument [Line Items]          
Outstanding debt $ 117.7   107.7    
Infrastructure | 3.25% Term Loan due 2026 | Real Estate Term Advance | DBM Global Credit Facilities | Revolving Credit Facility          
Debt Instrument [Line Items]          
Interest rate 3.25%        
Outstanding debt $ 93.0   99.5    
Infrastructure | 4.00% Note due 2024 | Real Estate Term Advance          
Debt Instrument [Line Items]          
Interest rate 4.00%        
Outstanding debt $ 7.5   15.0    
Infrastructure | 8.00% Note due 2024 | Real Estate Term Advance          
Debt Instrument [Line Items]          
Interest rate 8.00%        
Outstanding debt $ 12.1   18.7    
Infrastructure | Prime Rate | PRIME minus 0.85% Line of Credit due 2024 | Real Estate Term Advance | DBM Global Credit Facilities | Revolving Credit Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.85%        
Spectrum          
Debt Instrument [Line Items]          
Total aggregate finance lease and debt payments $ 69.7 $ 69.7 69.7    
Spectrum | 8.50% Note          
Debt Instrument [Line Items]          
Interest rate 8.50%        
Outstanding debt $ 19.3   19.3    
Spectrum | 11.45% Notes          
Debt Instrument [Line Items]          
Interest rate 11.45%        
Outstanding debt $ 50.4   50.4    
Life Sciences          
Debt Instrument [Line Items]          
Total aggregate finance lease and debt payments $ 17.4   10.8    
Life Sciences | 20.00% Note due 2023          
Debt Instrument [Line Items]          
Interest rate 20.00%        
Short-term debt $ 17.4   0.0    
Life Sciences | 18.00% Note due 2023          
Debt Instrument [Line Items]          
Interest rate 18.00%        
Short-term debt $ 0.0   10.8    
Non-Operating Corporate          
Debt Instrument [Line Items]          
Total aggregate finance lease and debt payments 436.9   401.8    
Non-Operating Corporate | 8.50% Senior Secured Notes due 2026 | Secured Debt          
Debt Instrument [Line Items]          
Interest rate       8.50% 8.50%
Outstanding debt $ 330.0   330.0    
Non-Operating Corporate | 7.50% Convertible Senior Notes due 2026          
Debt Instrument [Line Items]          
Interest rate 7.50%        
Outstanding debt $ 51.8   51.8    
Non-Operating Corporate | SOFR plus 5.75% Line of Credit          
Debt Instrument [Line Items]          
Outstanding debt 20.0   20.0    
Non-Operating Corporate | CGIC Unsecured Note due 2026          
Debt Instrument [Line Items]          
Outstanding debt $ 35.1   $ 0.0    
Non-Operating Corporate | SOFR | SOFR plus 5.75% Line of Credit          
Debt Instrument [Line Items]          
Basis spread on variable rate 5.75%