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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 55.0	$ 36.0
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $0.2 and $0.4, respectively	0.7	0.6
Postretirement Benefit Plans:
Amortization of prior service cost, net of tax of ($0.1) and ($0.0), respectively	(0.5)	0.0
Other comprehensive income, net of tax	0.2	0.6
Comprehensive income	$ 55.2	$ 36.6

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