Intangible Assets, net (Tables)

12 Months Ended

Dec. 31, 2018

Intangible Assets, net

Summary of intangible assets, net

		December 31, 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	4.8	$	0.8	$	(0.4)	$	0.8	$	(0.4)
Customer lists/relationships	14.9		707.3		(393.4)		745.0		(391.3)
Software	10.0		8.1		(8.1)		8.1		(8.1)
Other	7.4		1.0		(0.9)		6.3		(5.9)
			717.2		(402.8)		760.2		(405.7)
Intangible assets not subject to amortization:
Trade names			757.6		—		757.6		—
		$	1,474.8	$	(402.8)	$	1,517.8	$	(405.7)

Summary of estimated aggregate amortization expense

	(in millions)
2019	$	43.0
2020		43.0
2021		41.3
2022		36.7
2023		30.7