Income Taxes (Schedule of Deferred Tax Accounts) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventory and accounts receivable, deferred tax asset	$ 19.2	$ 19.7
Fixed assets and intangibles, deferred tax asset	8.6	3.3
Postemployment and other benefit liabilities, deferred tax asset	702.5	643.1
Product liability, deferred tax asset	191.0ir_DeferredTaxAssetsProductLiability	221.7ir_DeferredTaxAssetsProductLiability
Other reserves and accruals, deferred tax asset	190.5	198.5
Net operating losses and credit carryforwards, deferred tax asset	505.9	707.1
Other, deferred tax asset	77.3us-gaap_DeferredTaxAssetsOther	59.2us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	1,695.0us-gaap_DeferredTaxAssetsGross	1,852.6us-gaap_DeferredTaxAssetsGross
Deferred tax valuation allowances	(210.7)	(218.5)	(156.2)	(308.4)
Deferred tax assets net of valuation allowances	1,484.3us-gaap_DeferredTaxAssetsNet	1,634.1us-gaap_DeferredTaxAssetsNet
Inventory and accounts receivable, deferred tax liability	(42.8)	(46.8)
Fixed assets and intangibles, deferred tax liability	(1,999.6)	(2,046.8)
Postemployment and other benefit liabilities, deferred tax liability	(3.3)	(3.3)
Other reserves and accruals, deferred tax liability	(14.1)	(6.0)
Other, deferred tax liability	(20.3)us-gaap_DeferredTaxLiabilitiesOther	(49.1)us-gaap_DeferredTaxLiabilitiesOther
Gross deferred tax liability	(2,080.1)us-gaap_DeferredTaxLiabilities	(2,152.0)us-gaap_DeferredTaxLiabilities
Net deferred tax assets (liabilities)	$ (595.8)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (517.9)us-gaap_DeferredTaxAssetsLiabilitiesNet

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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