CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net changes in pension and other postretirement plan assets and benefit obligations recognized in other comprehensive, tax expense	$ 10.3		$ 10.3
Net reclassification adjustments for amounts recognized in net income (loss) as a component of net periodic benefit cost, tax expense	$ 0.5	$ 1.9	$ 3.2	$ 5.5