Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The carrying amount of goodwill during 2016 and 2015 were as follows (in millions):

	Year Ended December 31,
	2016		2015
Goodwill, beginning of year	$	22.9	$	22.9
Pine State acquisition	13.1		—
Goodwill, end of year	$	36.0	$	22.9

Schedule of Finite-Lived Intangible Assets

Intangible assets with definite lives are generally amortized on a straight-line basis over the following lives:

	Useful Life in Years
Customer relationships	10-15
Non-competition agreements	1-5
Trade names	1-2
Internally developed and other purchased software	3-7

The carrying amount and accumulated amortization of other intangible assets as of December 31, 2016 and 2015 are as follows (in millions):

	December 31, 2016							December 31, 2015
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	28.3	$	(9.4	)	$	18.9	$	21.1	$	(7.3	)	$	13.8
Non-competition agreements	5.0		(3.1		)	1.9		3.2		(2.9		)	0.3
Trade names	1.0		(0.3		)	0.7		—		—			—
Favorable lease terms	0.1		—			0.1		—		—			—
Internally developed and other purchased software	33.0		(13.1		)	19.9		25.8		(10.4		)	15.4
Total other intangible assets	$	67.4	$	(25.9	)	$	41.5	$	50.1	$	(20.6	)	$	29.5

Schedule of Expected Amortization Expense

Estimated future amortization expense for intangible assets is as follows (in millions):

Year ending December 31,
2017	$	6.5
2018	5.9
2019	5.6
2020	5.5
2021	5.1
2022 and thereafter	12.9
Total	$	41.5