Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash provided (required) by operating activities:
Net income	$ 103.6	$ 99.7
Adjustments to reconcile net income to cash provided (required) by operating activities:
Depreciation	37.7	24.4
Amortization	11.3	5.7
Employee benefit plan and stock-based compensation costs	25.0	22.5
Deferred income tax provision	24.3	4.7
Unrealized (gain) loss on derivative instruments	(2.7)	10.6
Other	2.1	0.8
Changes in operating assets and liabilities, net of effects of acquisitions:
Trade receivables, net	(147.9)	36.8
Inventories, net	(45.8)	(68.2)
Accounts payable, trade	1.3	6.1
Advance payments and progress billings	80.2	(35.5)
Income taxes	(32.8)	(21.2)
Accrued pension and other post-retirement benefits, net	(12.3)	(10.4)
Other assets and liabilities, net	(77.8)	(74.3)
Cash provided (required) by operating activities	(33.8)	1.7
Cash provided (required) by investing activities:
Capital expenditures	(78.9)	(92.0)
Other	2.0	1.0
Cash required by investing activities	(76.9)	(91.0)
Cash provided (required) by financing activities:
Net increase (decrease) in short-term debt	(11.9)	21.9
Net increase in commercial paper	152.0	96.2
Proceeds from the issuance of long-term debt	0.1
Repayments of long-term debt	(100.1)	(0.1)
Purchase of treasury stock	(27.0)	(0.5)
Payments related to taxes withheld on stock-based compensation	(16.0)	(34.0)
Excess tax benefits	6.9	21.8
Other	1.0	(0.2)
Cash provided by financing activities	5.0	105.1
Effect of exchange rate changes on cash and cash equivalents	0.2	1.8
Increase (decrease) in cash and cash equivalents	(105.5)	17.6
Cash and cash equivalents, beginning of period	342.1	344.0
Cash and cash equivalents, end of period	$ 236.6	$ 361.6