Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Components of Changes in Accumulated Other Comprehensive Income (AOCI)

Changes in accumulated other comprehensive income (loss) (AOCI) by component were as follows (dollars in millions). Amounts in parentheses indicate losses:

	Foreign Currency Translation Adjustments			Unrealized Loss on Foreign Exchange Contracts			Unrealized Loss on Marketable Debt Securities			Unfunded Employee Benefit Obligations			Total
Balance at January 1, 2021	$	(0.4	)	$	(0.2	)	$	0.3		$	(144.2	)	$	(144.5	)
Other comprehensive income before reclassifications,    net of tax		—			—			(0.2	)		—			(0.2	)
Amounts reclassified from AOCI, net of tax		0.4			—			—			7.5			7.9
Balance at September 30, 2021	$	—		$	(0.2	)	$	0.1		$	(136.7	)	$	(136.8	)

Reclassifications Out of Accumulated Other Comprehensive Income (AOCI)

Reclassifications out of AOCI were as follows (dollars in millions). Amounts in parentheses indicate expenses in the Consolidated Statements of Income:

	Amounts Reclassified from AOCI
	Three Months Ended September 30,						Nine Months Ended September 30,
Details about AOCI Components	2021			2020			2021			2020
Unfunded employee benefit obligations (a)
Amortization of prior service costs	$	(0.8	)	$	(1.0	)	$	(2.5	)	$	(3.0	)	See (a) below
Amortization of actuarial losses		(2.5	)		(2.6	)		(7.5	)		(7.8	)	See (a) below
		(3.3	)		(3.6	)		(10.0	)		(10.8	)	Total before tax
		0.8			0.9			2.5			2.7		Tax benefit
	$	(2.5	)	$	(2.7	)	$	(7.5	)	$	(8.1	)	Net of tax

(a)These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 13, Employee Benefit Plans and Other Postretirement Benefits, for additional information.