Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net income	$ 57.9	$ 105.6
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	42.0	44.4
Amortization of debt discount and deferred financing costs	1.3	4.5
Stock-based compensation	2.5	10.6
Retirement benefits, net	(14.1)	10.2
Loss on debt	22.7	10.5
Other, net	2.0	(0.9)
Changes in assets and liabilities:
Accounts receivable	(73.4)	(9.6)
Contract assets	(49.1)	(39.1)
Other current assets	(18.2)	19.1
Recoverable environmental remediation costs	4.7	(1.8)
Other noncurrent assets	40.4	16.9
Accounts payable	(18.2)	(2.8)
Contract liabilities	(15.4)	(65.0)
Other current liabilities	116.5	2.9
Deferred income taxes	(139.2)	(3.7)
Reserves for environmental remediation costs	(3.0)	2.7
Other noncurrent liabilities and other	(33.2)	(9.1)
Net Cash (Used in) Provided by Operating Activities	(73.8)	95.4
Investing Activities
Purchases of marketable securities	(1.0)	(1.9)
Capital expenditures	(24.2)	(17.3)
Net Cash Used in Investing Activities	(25.2)	(19.2)
Financing Activities
Dividend payments	(1.3)	(428.5)
Debt amendment costs	(1.7)	0.0
Debt repayments including conversion premium and irrevocable cash conversion option value	(259.6)	(175.5)
Repurchase of shares for withholding taxes and option costs under equity plans	(4.7)	(4.5)
Proceeds from shares issued under equity plans	0.4	7.7
Net Cash Used in Financing Activities	(266.9)	(600.8)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(365.9)	(524.6)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	703.4	1,152.5
Cash, Cash Equivalents and Restricted Cash at End of Period	337.5	627.9
Supplemental disclosures of cash flow information
Cash paid for interest	11.3	9.8
Cash paid for income taxes, net of refunds	50.2	19.5
Contribution of treasury stock to deferred compensation plan	$ 3.3	$ 0.0