Consolidated Statements Of Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Cumulative foreign currency translation	$ 2.1	$ 3.5	$ 0.5
Post retirement liability adjustments	(103.8)	(80.5)	$ (94.7)
Tax benefit associated with share-based compensation		$ 1.6
Accounting Standards Update 2016-09 [Member]
Cumulative effect on retained earnings, net of tax	$ 1.0