ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

6 Months Ended

Jun. 30, 2015

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of changes, net of tax, to accumulated other comprehensive loss

The following tables show the changes, net of tax, to our accumulated other comprehensive loss:

	Three Months Ended June 30, 2015									Six Months Ended June 30, 2015
(Millions)	Cash Flow Hedges			Defined Benefit Plans			Accumulated Other Comprehensive Loss			Cash Flow Hedges			Defined Benefit Plans			Accumulated Other Comprehensive Loss
Balance at the beginning of period	$	(3.1	)	$	(23.7	)	$	(26.8	)	$	(3.2	)	$	(24.4	)	$	(27.6	)
Other comprehensive income before reclassifications	—			0.7			0.7			—			0.7			0.7
Amounts reclassified out of accumulated other comprehensive loss	0.2			0.9			1.1			0.3			1.6			1.9
Net current period other comprehensive income	0.2			1.6			1.8			0.3			2.3			2.6
Balance at the end of period	$	(2.9	)	$	(22.1	)	$	(25.0	)	$	(2.9	)	$	(22.1	)	$	(25.0	)

	Three Months Ended June 30, 2014									Six Months Ended June 30, 2014
(Millions)	Cash Flow Hedges			Defined Benefit Plans			Accumulated Other Comprehensive Loss			Cash Flow Hedges			Defined Benefit Plans			Accumulated Other Comprehensive Loss
Balance at the beginning of period	$	(3.7	)	$	(19.9	)	$	(23.6	)	$	(3.1	)	$	(20.1	)	$	(23.2	)
Other comprehensive loss before reclassifications	—			—			—			—			(0.1		)	(0.1		)
Amounts reclassified out of accumulated other comprehensive loss	0.2			0.5			0.7			(0.4		)	0.8			0.4
Net current period other comprehensive income (loss)	0.2			0.5			0.7			(0.4		)	0.7			0.3
Balance at the end of period	$	(3.5	)	$	(19.4	)	$	(22.9	)	$	(3.5	)	$	(19.4	)	$	(22.9	)