Intangible Assets

6 Months Ended

Jun. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

The following table outlines the Company’s identifiable intangible assets:

	June 30, 2016				December 31, 2015
(In millions)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Definite-lived intangibles
Customer relationships	$	1,867.4	$	251.1	$	2,017.0	$	174.4
Trade name	50.2		36.5		51.0		29.1
Non-compete agreements	16.2		8.8		18.7		6.8
Carrier relationships	12.1		12.1		12.1		12.1
Other intangible assets	2.2		2.1		2.2		2.1
	$	1,948.1	$	310.6	$	2,101.0	$	224.5

The range of estimated useful lives and the weighted-average useful lives of the respective intangible assets by type are as follows:

Classification	Estimated Useful Life	Weighted-Average Amortization Period
Customer relationships	1.5 to 16 years	13.33 years
Trade names	1.2 to 3.5 years	2.86 years
Non-compete agreements	Term of agreement	4.60 years
Other intangible assets	1.5 to 5 years	4.24 years

Intangible asset amortization expense recorded in sales, general and administrative expense was $44.1 million and $29.6 million for the three-month periods ended June 30, 2016 and 2015, respectively, and $86.1 million and $47.6 million for the six-month periods ended June 30, 2016 and 2015, respectively.