Schedule II-Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2015

Valuation and Qualifying Accounts [Abstract]

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

VALUATION AND QUALIFYING ACCOUNTS

Description	Balance at Beginning of Year		Additions Charged to Costs and Expenses		Reductions (1)			Balance at End of Year
(millions)
Allowance for doubtful accounts
Year ended December 31, 2015	$	1.0	$	0.7	$	(0.8	)	$	0.9
Year ended December 31, 2014	0.7		0.7		(0.5		)	1.0
Year ended December 31, 2013	$	0.5	$	0.6	$	(0.4	)	$	0.7
Tax valuation account
Year ended December 31, 2015	$	12.3	—		(5.5		)	$	6.8
Year ended December 31, 2014	21.3		—		(9.0		)	$	12.3
Year ended December 31, 2013	$	25.3	2.1		(6.0		)	$	21.3

(1) Represents uncollectible accounts written off and reversal of provision.