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Note 3 - Revenues - Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 726.1	$ 689.8
UNITED STATES
Revenues	561.1	523.6
UNITED KINGDOM
Revenues	48.4	45.8
Other Countries [Member]
Revenues	116.6	120.4
Insurance [Member]
Revenues	535.6	495.3
Insurance [Member] | Underwriting and Rating [Member]
Revenues	377.1	350.0
Insurance [Member] | Claims [Member]
Revenues	158.5	145.3
Energy and Specialized Markets [Member]
Revenues	156.2	154.2
Financial Services [Member]
Revenues	$ 34.3	$ 40.3

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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