Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash provided (required) by operating activities:
Net income	$ 148.1us-gaap_ProfitLoss	$ 136.5us-gaap_ProfitLoss
Adjustments to reconcile net income to cash provided (required) by operating activities:
Depreciation	42.2us-gaap_Depreciation	41.9us-gaap_Depreciation
Amortization	15.6us-gaap_AdjustmentForAmortization	12.2us-gaap_AdjustmentForAmortization
Employee benefit plan and stock-based compensation costs	26.6	23.1
Deferred income tax provision	17.0us-gaap_DeferredIncomeTaxExpenseBenefit	10.3us-gaap_DeferredIncomeTaxExpenseBenefit
Unrealized loss on derivative instruments	10.4us-gaap_UnrealizedGainLossOnDerivatives	0.8us-gaap_UnrealizedGainLossOnDerivatives
Other	9.9us-gaap_OtherNoncashIncomeExpense	4.6us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions:
Trade receivables, net	254.8us-gaap_IncreaseDecreaseInReceivables	(170.2)us-gaap_IncreaseDecreaseInReceivables
Inventories, net	(23.3)us-gaap_IncreaseDecreaseInInventories	(14.7)us-gaap_IncreaseDecreaseInInventories
Accounts payable, trade	(78.5)	(51.0)
Advance payments and progress billings	(138.9)	124.0
Income taxes payable, net	(23.4)	(12.0)
Accrued pension and other post-retirement benefits, net	(13.9)	(14.0)
Other assets and liabilities, net	(71.0)	(39.7)
Cash provided by operating activities	175.6	51.8
Cash provided (required) by investing activities:
Capital expenditures	(86.7)	(92.0)
Other	5.3	2.0
Cash required by investing activities	(81.4)	(90.0)
Cash provided (required) by financing activities:
Net decrease in short-term debt	(0.3)	(20.5)
Net increase in commercial paper	9.0	8.5
Repayments of long-term debt	(0.3)us-gaap_RepaymentsOfLongTermDebt	(1.6)us-gaap_RepaymentsOfLongTermDebt
Purchase of treasury stock	(30.8)	(45.8)
Payments related to taxes withheld on stock-based compensation	(7.6)	(12.1)
Excess (deficit) tax benefits	(0.9)	1.9
Other		(0.4)
Cash required by financing activities	(30.9)	(70.0)
Effect of exchange rate changes on cash and cash equivalents	(7.0)	(0.6)
Increase (decrease) in cash and cash equivalents	56.3	(108.8)
Cash and cash equivalents, beginning of period	638.8	399.1
Cash and cash equivalents, end of period	$ 695.1	$ 290.3

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