Intangible Assets, net (Tables)

9 Months Ended

Sep. 30, 2018

Intangible Assets, net

Summary of intangible assets, net

		September 30, 2018				December 31, 2017
	Weighted Average	Gross				Gross
	Amortizable	Carrying		Accumulated		Carrying		Accumulated
	Life in Years	Amount		Amortization		Amount		Amortization
		(in millions)
Intangible assets subject to amortization:
Covenants not to compete	4.7	$	0.9	$	(0.5)	$	0.8	$	(0.4)
Customer lists/relationships	15.1		698.2		(384.6)		745.0		(391.3)
Software	10.0		8.1		(8.1)		8.1		(8.1)
Other	7.6		1.0		(0.9)		6.3		(5.9)
			708.2		(394.1)		760.2		(405.7)
Intangible assets not subject to amortization:
Trade names			750.4		—		757.6		—
		$	1,458.6	$	(394.1)	$	1,517.8	$	(405.7)

Summary of estimated aggregate amortization expense

	(in millions)
2018 (remaining three months)	$	10.5
2019		41.9
2020		41.9
2021		40.2
2022		35.5
2023		29.5