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Retirement and Other Benefit Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) plan	Dec. 31, 2019 USD ($) plan	Dec. 31, 2018 USD ($) plan
Retirement Benefits [Abstract]
Number of defined contribution plans maintained by the company | plan	4	4	4
Defined contribution retirement plan cost | $	$ 33.8	$ 36.9	$ 31.2

X

- Definition

Number of defined contribution plans maintained by the company.

+ References

No definition available.

+ Details

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Namespace Prefix:	rop_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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