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Consolidated Statements of Changes in Stockholders' Equity Parenthetical (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Changes in Stockholders' Equity [Abstract]
Currency translation adjustments, tax	$ 3,916us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	$ 2,406us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	$ 907us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Conversion of senior subordinated convertible notes, tax	$ 115rop_ConversionOfSeniorSubordinatedConvertibleNotesTax
Dividends declared (in dollars per share)	$ 0.85us-gaap_CommonStockDividendsPerShareDeclared	$ 0.70us-gaap_CommonStockDividendsPerShareDeclared	$ 0.58us-gaap_CommonStockDividendsPerShareDeclared

X

- Definition

Amount of tax expense (benefit) related to the conversion of senior subordinated convertible notes.

+ References

No definition available.

+ Details

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X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580

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