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Total operating assets for a company, which typically excludes intangible assets and other assets.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The net result for the period of deducting operating expenses from operating revenues.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Segment and Geographic Area Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012
Business Segments [Abstract]
Number of operating segments									4us-gaap_NumberOfOperatingSegments
Schedule of Segment Reporting Information, by Segment [Line Items]
Net sales	$ 946,145us-gaap_SalesRevenueNet	$ 884,122us-gaap_SalesRevenueNet	$ 885,175us-gaap_SalesRevenueNet	$ 834,052us-gaap_SalesRevenueNet	$ 889,173us-gaap_SalesRevenueNet	$ 827,810us-gaap_SalesRevenueNet	$ 784,010us-gaap_SalesRevenueNet	$ 737,135us-gaap_SalesRevenueNet	$ 3,549,494us-gaap_SalesRevenueNet	$ 3,238,128us-gaap_SalesRevenueNet	$ 2,993,489us-gaap_SalesRevenueNet
Operating profit	283,749us-gaap_OperatingIncomeLoss	245,658us-gaap_OperatingIncomeLoss	246,666us-gaap_OperatingIncomeLoss	223,400us-gaap_OperatingIncomeLoss	258,089us-gaap_OperatingIncomeLoss	219,349us-gaap_OperatingIncomeLoss	179,746us-gaap_OperatingIncomeLoss	185,177us-gaap_OperatingIncomeLoss	999,473us-gaap_OperatingIncomeLoss	842,361us-gaap_OperatingIncomeLoss	757,587us-gaap_OperatingIncomeLoss
Assets:
Operating assets	949,239rop_SegmentReportingOperatingAssets				966,463rop_SegmentReportingOperatingAssets				949,239rop_SegmentReportingOperatingAssets	966,463rop_SegmentReportingOperatingAssets	933,615rop_SegmentReportingOperatingAssets
Intangible assets, net	6,689,420				6,589,134				6,689,420	6,589,134	5,567,724
Other	774,275us-gaap_OtherAssets				629,384us-gaap_OtherAssets				774,275us-gaap_OtherAssets	629,384us-gaap_OtherAssets	569,765us-gaap_OtherAssets
Total	8,412,934us-gaap_Assets				8,184,981us-gaap_Assets				8,412,934us-gaap_Assets	8,184,981us-gaap_Assets	7,071,104us-gaap_Assets
Capital expenditures									37,644	42,528	38,405
Depreciation and other amortization									197,284	189,190	154,748
Industrial Technology [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Net sales									827,145	779,564	795,240
Operating profit									247,596	223,053	244,691
Assets:
Operating assets	220,115				232,505				220,115	232,505	225,620
Intangible assets, net	557,593				583,822				557,593	583,822	590,175
Other	120,681				75,215				120,681	75,215	100,102
Capital expenditures									10,713	17,043	14,030
Depreciation and other amortization									21,135	21,551	21,754
Energy Systems And Controls [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Net sales									691,813	651,920	646,116
Operating profit									203,021	183,679	179,824
Assets:
Operating assets	219,284				214,926				219,284	214,926	199,016
Intangible assets, net	568,670				597,250				568,670	597,250	555,667
Other	223,831				167,879				223,831	167,879	80,230
Capital expenditures									4,634	4,952	5,532
Depreciation and other amortization									23,281	21,353	19,671
Medical and Scientific Imaging [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Net sales									1,080,309	902,281	703,835
Operating profit									375,867	268,172	187,246
Assets:
Operating assets	232,380				237,681				232,380	237,681	232,527
Intangible assets, net	3,842,180				3,682,465				3,842,180	3,682,465	2,631,085
Other	147,529				152,211				147,529	152,211	114,834
Capital expenditures									11,430	10,231	8,253
Depreciation and other amortization									93,683	85,177	50,309
RF Technology [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Net sales									950,227	904,363	848,298
Operating profit									271,177	253,532	223,335
Assets:
Operating assets	270,458				266,026				270,458	266,026	251,721
Intangible assets, net	1,720,977				1,725,597				1,720,977	1,725,597	1,790,797
Other	65,636				62,576				65,636	62,576	51,044
Capital expenditures									10,521	10,190	9,765
Depreciation and other amortization									58,702	60,590	62,629
Corporate [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Net sales									0	0	0
Operating profit									(98,188)	(86,075)	(77,509)
Assets:
Operating assets	7,002				15,325				7,002	15,325	24,731
Intangible assets, net	0				0				0	0	0
Other	216,598				171,503				216,598	171,503	223,555
Capital expenditures									346	112	825
Depreciation and other amortization									$ 483	$ 519	$ 385