Revenue and Contracts in Process - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2023
Revenue from External Customer [Line Items]
Accounts receivable, net, contracts with customers			$ 250.4
Term for majority of contracts, in excess of	1 year
Usual maximum percentage of payment withheld	10.00%
Retainage receivable	$ 94.1	$ 120.6
Retainage receivable, percent to be collected beyond one year	18.80%	9.00%
Contract assets	$ 106.3	$ 118.6
Contract liabilities	$ 109.1	153.5
Revenue, payment terms, general duration of payment period	30 days
Infrastructure
Revenue from External Customer [Line Items]
Contract assets			165.1
Contract liabilities			$ 98.6
Contract assets, increase due to new projects	$ 68.0	86.6
Contract assets, reclassified to receivables	80.3	133.1
Contract liabilities, increase due to new projects	102.3	146.2
Contract liabilities, revenue recognized	146.7	$ 91.3
Remaining performance obligation amount	$ 943.6
Life Sciences
Revenue from External Customer [Line Items]
Payment term, maximum	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Infrastructure | Within One Year
Revenue from External Customer [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 716.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Infrastructure | Within Five Years
Revenue from External Customer [Line Items]
Remaining performance obligation period	5 years
Remaining performance obligation amount	$ 227.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Spectrum | Broadcast station
Revenue from External Customer [Line Items]
Remaining performance obligation amount	$ 16.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Spectrum | Broadcast station | Within One Year
Revenue from External Customer [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 9.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Spectrum | Broadcast station | Within Five Years
Revenue from External Customer [Line Items]
Remaining performance obligation period	3 years
Remaining performance obligation amount	$ 7.0
DBMG | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Infrastructure
Revenue from External Customer [Line Items]
Remaining performance obligation period	2 years 3 months 18 days