CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Interest rate swaps, deferred tax expense (benefit)		$ (0.1)	$ 0.4	$ (0.2)
Capitalized swap interest, deferred tax benefit	$ (0.2)	$ (0.2)	$ (0.5)	$ (0.5)