Intangible Assets, net (Tables)

12 Months Ended

Dec. 31, 2016

Intangible Assets, net

Summary of intangible assets, net

		December 31, 2016				December 31, 2015
	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	$	1.1	$	(0.6)	$	1.3	$	(1.0)
Customer lists/relationships	14.6		736.7		(338.9)		659.0		(285.7)
Software – internal use	10.0		8.1		(8.1)		8.1		(7.9)
Other	5.2		6.3		(5.5)		6.3		(5.0)
			752.2		(353.1)		674.7		(299.6)
Intangible assets not subject to amortization:
Trade names			752.2		—		750.3		—
		$	1,504.4	$	(353.1)	$	1,425.0	$	(299.6)

Summary of estimated aggregate amortization expense

	(in millions)
2017		50.3
2018		46.0
2019		45.9
2020		45.9
2021		42.0