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Note 12 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
Current income taxes: |  | ​ |  |  | ​ |  |  | ​ |
UK |  | $ | 14.3 |  |  | $ | 15.2 |  |  | $ | 10.5 |
U.S., including state and local |  |  | 143.2 |  |  |  | 88.1 |  |  |  | 95.9 |
International |  |  | 6.4 |  |  |  | 3.0 |  |  |  | 8.8 |
Total current income taxes |  |  | 163.9 |  |  |  | 106.3 |  |  |  | 115.2 |
Deferred income taxes: |  | ​ |  |  | ​ |  |  | ​ |
UK |  |  | 2.2 |  |  |  | (4.0 | ) |  |  | (10.3 | )
U.S., including state and local |  |  | 1.0 |  |  |  | (2.0 | ) |  |  | 10.0 |
International |  |  | (0.8 | ) |  |  | — |  |  |  | (14.0 | )
Total deferred income benefits |  |  | 2.4 |  |  |  | (6.0 | ) |  |  | (14.3 | )
Total income tax expense |  | $ | 166.3 |  |  | $ | 100.3 |  |  | $ | 100.9 |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
UK |  | $ | 57.4 |  |  | $ | 86.4 |  |  | $ | (44.1 | )
U.S. |  |  | 595.6 |  |  |  | 423.4 |  |  |  | 428.7 |
International |  |  | (41.1 | ) |  |  | 17.2 |  |  |  | (9.2 | )
Total income before taxes |  | $ | 611.9 |  |  | $ | 527.0 |  |  | $ | 375.4 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
UK statutory corporation tax rate |  |  | 25.0 | % |  |  | 23.5 | % |  |  | 19.0 | %
Effect of foreign tax rates |  |  | (1.7 | ) |  |  | 0.1 |  |  |  | 6.3 |
Equity-based compensation |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.7 |
Tax adjustments |  |  | 0.9 |  |  |  | 0.5 |  |  |  | 2.0 |
Impact of changes in statutory tax rates on deferred taxes |  |  | — |  |  |  | (1.9 | ) |  |  | (1.3 | )
Foreign currency translation reserves reclassification |  |  | 5.6 |  |  |  | 1.6 |  |  |  | (0.3 | )
Taxes applicable to prior years |  |  | (1.2 | ) |  |  | (1.9 | ) |  |  | (4.5 | )
Other, net |  |  | (1.7 | ) |  |  | (3.4 | ) |  |  | 0.3 |
Effective income tax rate, controlling interest |  |  | 27.3 | % |  |  | 18.8 | % |  |  | 22.2 | %
Net loss (income) attributable to noncontrolling interests |  |  | (0.1 | ) |  |  | 0.2 |  |  |  | 4.7 |
Total effective income tax rate |  |  | 27.2 | % |  |  | 19.0 | % |  |  | 26.9 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
​ |  | December 31, |
​ |  | 2024 |  |  | 2023 |
Deferred tax assets: |  | ​ |  |  | ​ |
Compensation and staff benefits |  | $ | 64.5 |  |  | $ | 59.8 |
Loss carryforwards(1) |  |  | 127.6 |  |  |  | 88.4 |
Accrued liabilities |  |  | 8.0 |  |  |  | 7.0 |
Lease liabilities |  |  | 18.7 |  |  |  | 16.8 |
Other |  |  | (2.1 | ) |  |  | 5.3 |
Gross deferred tax assets |  |  | 216.7 |  |  |  | 177.3 |
Valuation allowance |  |  | (119.4 | ) |  |  | (76.8 | )
Deferred tax assets, net of valuation allowance |  | $ | 97.3 |  |  | $ | 100.5 |
Deferred tax liabilities: |  | ​ |  |  | ​ |
Retirement benefits |  | $ | (17.4 | ) |  | $ | (21.4 | )
Goodwill and acquired intangible assets |  |  | (628.9 | ) |  |  | (628.6 | )
Lease ROU assets |  |  | (18.0 | ) |  |  | (16.2 | )
Other |  |  | (1.3 | ) |  |  | (3.5 | )
Gross deferred tax liabilities |  |  | (665.6 | ) |  |  | (669.7 | )
Total deferred tax liabilities(2) |  | $ | (568.3 | ) |  | $ | (569.2 | )
​ |  | December 31, |
​ |  | 2024 |  |  | 2023 |
Deferred tax assets, net (included in other non-current assets) |  | $ | 1.0 |  |  | $ | 1.6 |
Deferred tax liabilities, net |  |  | (569.3 | ) |  |  | (570.8 | )
Total deferred tax liabilities |  | $ | (568.3 | ) |  | $ | (569.2 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
Beginning balance |  | $ | 28.4 |  |  | $ | 26.7 |  |  | $ | 19.2 |
Additions for tax positions of current year |  |  | 5.7 |  |  |  | 6.9 |  |  |  | 9.7 |
Reduction due to settlement with taxing authorities |  |  | (0.8 | ) |  |  | (0.3 | ) |  |  | (1.4 | )
Reduction due to statute expirations |  |  | (4.3 | ) |  |  | (4.6 | ) |  |  | (0.5 | )
Total change due to true up |  |  | — |  |  |  | (0.1 | ) |  |  | — |
Total removed due to audit payment |  |  | — |  |  |  | (0.4 | ) |  |  | — |
Foreign currency translation |  |  | (0.1 | ) |  |  | 0.2 |  |  |  | (0.3 | )
Ending balance |  | $ | 28.9 |  |  | $ | 28.4 |  |  | $ | 26.7 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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