CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other comprehensive income (loss):
Tax (provision) benefit, Pension and postretirement liability adjustments	$ (4.3)	$ 0.9	$ 3.9
Tax (provision) benefit, Change in fair value of cash flow hedges	(0.2)	0	0.1
Tax (provision) benefit, Reclassification adjustment for hedge gains and losses included in net income (loss)	$ (0.2)	$ 0	$ 0.3