CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Projected pension benefit obligation, tax expense (benefit)	$ 0.2	$ (1.2)	$ 0.2
Unrealized (loss) gain on interest rate swap, tax expense (benefit)	$ (3.6)	$ (0.1)	$ 1.7