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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ (51.6)	$ 12.1	$ 22.8	$ 10.3	$ (39.6)	$ 33.1
Defined benefit pension and other postretirement employee benefits:
Amortization of actuarial loss included in net periodic cost, net of tax of $0.7, $0.6, $1.3 and $1.3	1.9		1.8		3.8	3.7
Other comprehensive income (loss), net of tax	1.9		1.8		3.8	3.7
Comprehensive income	$ (49.7)		$ 24.6		$ (35.8)	$ 36.8

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