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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Income Taxes |  |  |  |
Provision for income taxes | $ (130.6) | $ (144.5) | $ (247.8) | $ (278.7)
Effective tax rate | 21.90% | 23.30% | 21.40% | 23.50%
Excess tax benefit from option exercises | $ 11.9 | $ 7.5 | $ 29.0 | $ 11.3
Excess tax benefit, impact on effective tax rate | (2.00%) | (1.20%) | (2.50%) | (1.00%)
Impact of gain associated with the bargain purchase acquisition on the effective tax rate | (0.20%) |  | (0.10%) |
Impact of acquisition-related expenses on the effective tax rate | 0.10% |  | 0.10% |

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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 35 -Paragraph 2 -SubTopic 740 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480887/718-740-35-2 + Details
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