Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2023

Intangible Assets, Net

Summary of intangible assets, net

		December 31, 2023				December 31, 2022
	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	14.2	$	716.0	$	(520.5)	$	713.6	$	(479.3)
Backlog of orders	7.9		22.9		(6.0)		22.3		(3.1)
Other	9.4		10.0		(9.5)		9.9		(9.5)
			748.9		(536.0)		745.8		(491.9)
Intangible assets not subject to amortization:
Trade names			768.2		—		765.7		—
		$	1,517.1	$	(536.0)	$	1,511.5	$	(491.9)

Summary of estimated aggregate amortization expense

	(in millions)
2024	$	40.4
2025		36.3
2026		26.8
2027		26.1
2028		24.6
Thereafter		58.7
	$	212.9