Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount of long-term debt and lease obligation, including portion classified as current.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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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%