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Note 6 - Revenues - Disaggregated Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 2,784.6	$ 2,607.1	$ 2,395.1
UNITED STATES
Revenues	2,133.6	2,005.6	1,849.4
UNITED KINGDOM
Revenues	181.6	177.3	148.2
Other Countries [Member]
Revenues	469.4	424.2	397.5
Insurance [Member]
Revenues	1,986.3	1,865.2	1,714.9
Insurance [Member] | Underwriting and Rating [Member]
Revenues	1,390.6	1,254.3	1,153.5
Insurance [Member] | Claims [Member]
Revenues	595.7	610.9	561.4
Energy and Specialized Markets [Member]
Revenues	641.6	563.9	504.3
Financial Services [Member]
Revenues	$ 156.7	$ 178.0	$ 175.9

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

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