CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 47.1	$ 55.0
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $0.2 and $0.2, respectively	0.7	0.7
Settlement cost, net of tax of $2.2 and $0.0, respectively	6.6	0.0
Postretirement Benefit Plans:
Amortization of prior service credit, net of tax of ($0.1) and ($0.1), respectively	(0.5)	(0.5)
Other comprehensive income, net of tax	6.8	0.2
Comprehensive income	$ 53.9	$ 55.2