CONSOLIDATED CONDENSED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (Parentheticals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net change in postretirement benefit plans, Tax Benefits	$ 2.1	$ 0.6	$ 3.0	$ 1.6
Amortization of prior service costs, Tax (Expense) Benefit	(0.2)	(0.6)	(1.2)	(1.6)
Amortization of net actuarial loss, Tax Benefits	1.0	1.2	2.9	3.2
Loss from curtailment, Tax Benefit	$ 1.3	$ 0.0	$ 1.3	$ 0.0