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Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Product Information [Line Items]
Claim recovery estimates	$ 88.0			$ 88.0		$ 77.9
Revenue recognized	16.7	$ 17.5		$ 270.0	$ 188.6
Customer Concentration Risk | Accounts Receivable | Brightline Trains Florida LLC
Product Information [Line Items]
Concentration risk			11.10%	9.10%
Performance Obligations
Product Information [Line Items]
Revenue adjustment	$ 43.3	$ 41.6		$ 220.7	$ 131.3

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Aggregate affirmative claim recovery estimate included in contract asset and liability balances.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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