Intangible Assets, Net (Tables)

9 Months Ended

Sep. 30, 2024

Intangible Assets, Net

Summary of intangible assets, net

		September 30, 2024				December 31, 2023
	Weighted Average	Gross				Gross
	Amortizable	Carrying		Accumulated		Carrying		Accumulated
	Life in Years	Amount		Amortization		Amount		Amortization
		(in millions)
Intangible assets subject to amortization:
Customer lists/relationships	14.0	$	755.1	$	(550.5)	$	716.0	$	(520.5)
Backlog of orders	7.9		22.4		(8.0)		22.9		(6.0)
Other	9.3		10.2		(9.6)		10.0		(9.5)
			787.7		(568.1)		748.9		(536.0)
Intangible assets not subject to amortization:
Trade names			811.9		—		768.2		—
		$	1,599.6	$	(568.1)	$	1,517.1	$	(536.0)

Summary of estimated aggregate amortization expense

	(in millions)
2024 (remaining three months)	$	10.6
2025		39.3
2026		29.8
2027		29.2
2028		27.7
Thereafter		83.0
	$	219.6