Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 17.2	$ 33.5	$ 78.7	$ 86.9
Loss from discontinued operations, net of taxes	0.0	0.0	0.0	0.3
Income from continuing operations	17.2	33.5	78.7	87.2
Adjustments to reconcile income from continuing operations to cash provided by continuing operating activities:
Depreciation and amortization			53.2	47.5
Stock-based compensation			0.9	7.2
Other			8.2	4.9
Changes in operating assets and liabilities:
Trade receivables, net and contract assets			54.5	(16.2)
Inventories			14.4	(18.5)
Accounts payable, trade and other			(46.6)	(12.8)
Advance and progress payments			4.2	(37.1)
Accrued pension and other postretirement benefits, net			(0.6)	(7.2)
Other assets and liabilities, net			(5.8)	(19.9)
Cash provided by continuing operating activities			161.1	35.1
Cash required by discontinued operating activities			0.0	(0.2)
Cash provided by operating activities			161.1	34.9
Cash flows from investing activities:
Acquisitions, net of cash acquired			(4.5)	(368.4)	$ (387.9)
Capital expenditures			(22.7)	(29.2)
Proceeds from disposal of assets			1.2	1.3
Cash required by investing activities			(26.0)	(396.3)
Cash flows from financing activities:
Net (payments) proceeds on short-term debt			(0.7)	1.1
Net (payments) proceeds from domestic credit facilities			(108.9)
Net (payments) proceeds from domestic credit facilities				387.0
Settlement of taxes withheld on stock-based compensation awards			(2.2)	(6.5)
Deferred acquisition payments			0.0	(3.6)
Dividends			(9.5)	(9.5)
Cash (required) provided by financing activities			(121.3)	368.5
Effect of foreign exchange rate changes on cash and cash equivalents			(2.7)	(1.0)
Increase in cash and cash equivalents			11.1	6.1
Cash and cash equivalents, beginning of period			39.5	43.0	43.0
Cash and cash equivalents, end of period	$ 50.6	$ 49.1	$ 50.6	$ 49.1	$ 50.6