Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Goodwill and Other Intangible Assets

The following table summarizes goodwill activity for the three years in the period ended December 31, 2015 (in millions):

			Accumulated			Goodwill,
	Goodwill		Impairments			Net
Balance at January 1, 2013	$	18.1	$	(11.8	)	$	6.3
No activity in 2013		—		—			—
Balance at December 31, 2013		18.1		(11.8	)		6.3
No activity in 2014		—		—			—
Balance at December 31, 2014		18.1		(11.8	)		6.3
No activity in 2015		—		—			—
Balance at December 31, 2015	$	18.1	$	(11.8	)	$	6.3

					Accumulated
	Cost				Amortization
	2015		2014		2015		2014
Amortizable intangible assets: (1)
Customer relationships	$	1.4	$	1.4	$	0.9	$	0.8

(1) Amortizable intangible assets are included in “Other Assets.”