CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other comprehensive income (loss), net of tax
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (491.8)	$ 47.1
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $0.3 and $0.2, respectively	0.8	0.7
Settlement cost, net of tax of $0.0 and $2.2, respectively	0.0	6.6
Postretirement Benefit Plans:
Amortization of prior service credit, net of tax of ($0.2) and ($0.1), respectively	(0.4)	(0.5)
Other comprehensive income (loss), net of tax	(0.9)	6.8
Comprehensive income (loss)	(492.7)	53.9
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	$ 1.3	$ 0.0