Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Tax expense (benefit) on current period cash flow hedging activity	$ (6.4)	$ (6.4)	$ (0.3)
Tax expense (benefit) on reclassification of hedging activities into earnings	6.0	2.5	(1.5)
Tax expense (benefit) on current period pension adjustments	(1.5)	(3.6)	7.1
Tax expense on reclassification of pension and postretirement into earnings	$ (0.9)	$ (1.5)	$ (1.7)