Guarantor Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net cash provided by (used in) continuing operating activities	$ 430.5	$ 379.5
Net cash provided by (used in) discontinued operating activities	(1.7)	(73.9)
Net cash provided by (used in) operating activities	428.8	305.6
Capital expenditures	(139.2)	(113.8)
Proceeds from sale of property, plant and equipment	4.3	12.0
Proceeds from business dispositions, net of cash sold	4.4	0
Net cash provided by (used in) continuing investing activities	(130.5)	(101.8)
Net cash provided by (used in) discontinued investing activities	0	36.0
Net cash provided by (used in) investing activities	(130.5)	(65.8)
Net proceeds (repayments) in debt	1,549.4	(352.9)
Debt issuance costs	(13.2)	(2.5)
Net inter-company proceeds (payments)	0	0
Dividends paid	132.0	109.9
Proceeds from shares issued under incentive plans	118.6	24.9
Repurchase of ordinary shares	477.6	35.0
Other, net	0	(4.9)
Net cash provided by (used in) continuing financing activities	1,045.2	(480.3)
Effect of exchange rate changes on cash and cash equivalents	(25.1)	(16.8)
Net increase (decrease) in cash and cash equivalents	1,318.4	(257.3)
Cash and cash equivalents - beginning of period	882.1	1,160.7
Cash and cash equivalents - end of period	2,200.5	903.4
IR Ireland [Member]
Net cash provided by (used in) continuing operating activities	(7.8)	(5.3)
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	(7.8)	(5.3)
Capital expenditures	0	0
Proceeds from sale of property, plant and equipment	0	0
Proceeds from business dispositions, net of cash sold	0
Net cash provided by (used in) continuing investing activities	0	0
Net cash provided by (used in) discontinued investing activities	0	0
Net cash provided by (used in) investing activities	0	0
Net proceeds (repayments) in debt	0	0
Debt issuance costs	0	0
Net inter-company proceeds (payments)	491.2	116.7
Dividends paid	124.4	96.4
Proceeds from shares issued under incentive plans	118.6	24.9
Repurchase of ordinary shares	477.6	35.0
Other, net	0	(4.9)
Net cash provided by (used in) continuing financing activities	7.8	5.3
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
IR Limited [Member]
Net cash provided by (used in) continuing operating activities	0	(0.4)
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	0	(0.4)
Capital expenditures	0	0
Proceeds from sale of property, plant and equipment	0	0
Proceeds from business dispositions, net of cash sold	0
Net cash provided by (used in) continuing investing activities	0	0
Net cash provided by (used in) discontinued investing activities	0	0
Net cash provided by (used in) investing activities	0	0
Net proceeds (repayments) in debt	0	0
Debt issuance costs	0	0
Net inter-company proceeds (payments)	0	0.4
Dividends paid	0	0
Proceeds from shares issued under incentive plans	0	0
Repurchase of ordinary shares	0	0
Other, net	0	0
Net cash provided by (used in) continuing financing activities	0	0.4
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
IR International [Member]
Net cash provided by (used in) continuing operating activities	(6.6)	(7.5)
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	(6.6)	(7.5)
Capital expenditures	0	0
Proceeds from sale of property, plant and equipment	0	0
Proceeds from business dispositions, net of cash sold	0
Net cash provided by (used in) continuing investing activities	0	0
Net cash provided by (used in) discontinued investing activities	0	0
Net cash provided by (used in) investing activities	0	0
Net proceeds (repayments) in debt	0	0
Debt issuance costs	0	0
Net inter-company proceeds (payments)	6.6	7.5
Dividends paid	0	0
Proceeds from shares issued under incentive plans	0	0
Repurchase of ordinary shares	0	0
Other, net	0	0
Net cash provided by (used in) continuing financing activities	6.6	7.5
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
IR Global [Member]
Net cash provided by (used in) continuing operating activities	(81.1)	(391.7)
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	(81.1)	(391.7)
Capital expenditures	0	0
Proceeds from sale of property, plant and equipment	0	0
Proceeds from business dispositions, net of cash sold	0
Net cash provided by (used in) continuing investing activities	0	0
Net cash provided by (used in) discontinued investing activities	0	0
Net cash provided by (used in) investing activities	0	0
Net proceeds (repayments) in debt	1,546.2	(344.5)
Debt issuance costs	(13.2)	(2.5)
Net inter-company proceeds (payments)	(243.4)	496.9
Dividends paid	0	0
Proceeds from shares issued under incentive plans	0	0
Repurchase of ordinary shares	0	0
Other, net	0	0
Net cash provided by (used in) continuing financing activities	1,289.6	149.9
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	1,208.5	(241.8)
Cash and cash equivalents - beginning of period	61.9	241.8
Cash and cash equivalents - end of period	1,270.4	0
IR New Jersey [Member]
Net cash provided by (used in) continuing operating activities	(52.6)	(97.8)
Net cash provided by (used in) discontinued operating activities	(17.4)	21.8
Net cash provided by (used in) operating activities	(70.0)	(76.0)
Capital expenditures	(34.2)	(31.3)
Proceeds from sale of property, plant and equipment	0.2	0.5
Proceeds from business dispositions, net of cash sold	0
Net cash provided by (used in) continuing investing activities	(34.0)	(30.8)
Net cash provided by (used in) discontinued investing activities	0	0
Net cash provided by (used in) investing activities	(34.0)	(30.8)
Net proceeds (repayments) in debt	(7.5)	(7.6)
Debt issuance costs	0	0
Net inter-company proceeds (payments)	366.8	113.4
Dividends paid	0	0
Proceeds from shares issued under incentive plans	0	0
Repurchase of ordinary shares	0	0
Other, net	0	0
Net cash provided by (used in) continuing financing activities	359.3	105.8
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	255.3	(1.0)
Cash and cash equivalents - beginning of period	59.1	77.8
Cash and cash equivalents - end of period	314.4	76.8
Other Subsidiaries [Member]
Net cash provided by (used in) continuing operating activities	579.4	982.3
Net cash provided by (used in) discontinued operating activities	15.7	(95.7)
Net cash provided by (used in) operating activities	595.1	886.6
Capital expenditures	(105.0)	(82.5)
Proceeds from sale of property, plant and equipment	4.1	11.5
Proceeds from business dispositions, net of cash sold	4.4
Net cash provided by (used in) continuing investing activities	(96.5)	(71.0)
Net cash provided by (used in) discontinued investing activities	0	36.0
Net cash provided by (used in) investing activities	(96.5)	(35.0)
Net proceeds (repayments) in debt	10.7	(0.8)
Debt issuance costs	0	0
Net inter-company proceeds (payments)	(621.2)	(734.9)
Dividends paid	8.4	113.6
Proceeds from shares issued under incentive plans	0	0
Repurchase of ordinary shares	0	0
Other, net	0	0
Net cash provided by (used in) continuing financing activities	(618.9)	(849.3)
Effect of exchange rate changes on cash and cash equivalents	(25.1)	(16.8)
Net increase (decrease) in cash and cash equivalents	(145.4)	(14.5)
Cash and cash equivalents - beginning of period	761.1	841.1
Cash and cash equivalents - end of period	615.7	826.6
Consolidating Adjustments [Member]
Net cash provided by (used in) continuing operating activities	(0.8)	(100.1)
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	(0.8)	(100.1)
Capital expenditures	0	0
Proceeds from sale of property, plant and equipment	0	0
Proceeds from business dispositions, net of cash sold	0
Net cash provided by (used in) continuing investing activities	0	0
Net cash provided by (used in) discontinued investing activities	0	0
Net cash provided by (used in) investing activities	0	0
Net proceeds (repayments) in debt	0	0
Debt issuance costs	0	0
Net inter-company proceeds (payments)	0	0
Dividends paid	(0.8)	(100.1)
Proceeds from shares issued under incentive plans	0	0
Repurchase of ordinary shares	0	0
Other, net	0	0
Net cash provided by (used in) continuing financing activities	0.8	100.1
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	$ 0	$ 0