CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Interest rate swaps, deferred tax expense	$ (3.0)	$ 0.1	$ (8.3)	$ 0.6
Capitalized swap interest, deferred tax benefit	0.0	0.1	0.1	0.1
Pension adjustment, tax	$ 0.4	$ 0.0	$ 0.4	$ 0.0