CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parentheticals) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent	[1]	$ 2.0	$ 1.3	$ 5.1	$ 4.0

[1] The tax expense included in pension and postretirement adjustments for the three and nine months ended September 30, 2021 was $2.0 million and $5.1 million, respectively. The tax expense included in pension and postretirement adjustments for the three and nine months ended September 30, 2020 was $1.3 million and $4.0 million, respectively.