Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension and postretirement liability adjustment, Tax	$ (1.1)	$ 13.1	$ 6.2
Dividend per share	$ 1.07	$ 1.04	$ 1.03