Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Balances	$ 4,549,998,000us-gaap_Goodwill	$ 3,868,857,000us-gaap_Goodwill
Goodwill acquired	207,943,000us-gaap_GoodwillAcquiredDuringPeriod	708,676,000us-gaap_GoodwillAcquiredDuringPeriod
Currency translation adjustments	(50,488,000)	(9,477,000)
Reclassification and other	3,238,000us-gaap_GoodwillOtherChanges	(18,058,000)us-gaap_GoodwillOtherChanges
Balances	4,710,691,000us-gaap_Goodwill	4,549,998,000us-gaap_Goodwill	3,868,857,000us-gaap_Goodwill
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	2,738,747,000	2,703,267,000
Accumulated amortization	(760,018,000)	(664,131,000)
Net book value	1,978,729,000us-gaap_FiniteLivedIntangibleAssetsNet	2,039,136,000us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense of other intangible assets	153,000,000rop_AmortizationOfOtherIntangibleAssets	147,000,000rop_AmortizationOfOtherIntangibleAssets	113,000,000rop_AmortizationOfOtherIntangibleAssets
Expected Amortization expense [Abstract]
2015	147,000,000
2016	143,000,000
2017	132,000,000
2018	125,000,000
2019	119,000,000
Trade Names [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	361,519,000	358,219,000
Accumulated amortization	0	0
Net book value	361,519,000	358,219,000
Assets subject to amortization \| Customer Relationships [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	1,975,334,000	1,936,336,000
Accumulated amortization	(543,594,000)	(464,018,000)
Net book value	1,431,740,000	1,472,318,000
Assets subject to amortization \| Unpatented Technology [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	217,260,000	216,044,000
Accumulated amortization	(134,702,000)	(120,091,000)
Net book value	82,558,000	95,953,000
Assets subject to amortization \| Software [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	156,449,000	160,618,000
Accumulated amortization	(62,882,000)	(58,084,000)
Net book value	93,567,000	102,534,000
Assets subject to amortization \| Patents and other protective rights Memeber
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	26,463,000	31,394,000
Accumulated amortization	(18,325,000)	(21,922,000)
Net book value	8,138,000	9,472,000
Assets subject to amortization \| Backlog [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	1,100,000
Accumulated amortization	(443,000)
Net book value	657,000
Assets subject to amortization \| Trade Names [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	622,000	656,000
Accumulated amortization	(72,000)	(16,000)
Net book value	550,000	640,000
Industrial Technology
Goodwill [Line Items]
Balances	425,501,000	421,755,000
Goodwill acquired	0	0
Currency translation adjustments	(16,537,000)	3,746,000
Reclassification and other	0	0
Balances	408,964,000	425,501,000
Energy Systems And Controls
Goodwill [Line Items]
Balances	434,697,000	404,057,000
Goodwill acquired	0	27,944,000
Currency translation adjustments	(8,002,000)	198,000
Reclassification and other	(112,000)	2,498,000
Balances	426,583,000	434,697,000
Medical And Scientific Imaging
Goodwill [Line Items]
Balances	2,435,506,000	1,772,402,000
Goodwill acquired	174,347,000	680,732,000
Currency translation adjustments	(18,847,000)	(13,345,000)
Reclassification and other	3,350,000	(4,283,000)
Balances	2,594,356,000	2,435,506,000
RF Technology
Goodwill [Line Items]
Balances	1,254,294,000	1,270,643,000
Goodwill acquired	33,596,000	0
Currency translation adjustments	(7,102,000)	(76,000)
Reclassification and other	0	(16,273,000)
Balances	$ 1,280,788,000	$ 1,254,294,000

The aggregate expense charged against earnings to allocate the cost of other intangible assets to the periods expected to benefit from such assets.

No definition available.

+ Details

Name:	rop_AmortizationOfOtherIntangibleAssets
Namespace Prefix:	rop_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	rop_ScheduleOfOtherIntangibleAssetsByMajorClassLineItems
Namespace Prefix:	rop_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References