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Debt Obligations - Schedule of Debt (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2021 | Feb. 01, 2021
Debt Instrument [Line Items] |  |  |  |
Obligations under finance leases | $ 0.9 | $ 2.4 |  |
Total aggregate finance lease and debt payments | 687.0 | 722.8 |  |
Unamortized issuance discount, issuance premium, and deferred financing costs | (11.3) | (13.0) |  |
Less: current portion of debt obligations | (34.2) | (30.5) |  |
Debt obligations, net of current portion | 641.5 | 679.3 |  |
Infrastructure |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Obligations under finance leases | 0.9 | 2.4 |  |
Total aggregate finance lease and debt payments | 159.7 | 198.8 |  |
Infrastructure | PRIME minus 0.75% Line of Credit due 2025 | Real Estate Term Advance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding debt | $ 70.0 | 100.0 |  |
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 | $ 86.3 | 91.4 |  |
Infrastructure | 4.00% Note due 2024 | Real Estate Term Advance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.00% |  |  |
Outstanding debt | $ 2.5 | 5.0 |  |
Infrastructure | Prime Rate | PRIME minus 0.75% Line of Credit due 2025 | Real Estate Term Advance | DBM Global Credit Facilities | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 0.75% |  |  |
Spectrum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total aggregate finance lease and debt payments | $ 69.7 | 69.7 |  |
Spectrum | 8.50% Note due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 8.50% |  |  |
Outstanding debt | $ 19.3 | 19.3 |  |
Spectrum | 11.45% Notes due 2025 |  |  |  |
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 | $ 20.7 | 17.4 |  |
Life Sciences | 20.00% Note due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 20.00% |  |  |
Short-term debt | $ 20.7 | 17.4 |  |
Non-Operating Corporate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total aggregate finance lease and debt payments | $ 436.9 | 436.9 |  |
Non-Operating Corporate | 8.50% Senior Secured Notes due 2026 | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 8.50% |  | 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 | $ 35.1 |  |
Non-Operating Corporate | SOFR | SOFR plus 5.75% Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 5.75% |  |  |

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