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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Taxes |  |  |  |
Provision for income taxes | $ (144.5) | $ (78.1) | $ (278.7) | $ (182.2)
Effective tax rate | 23.30% | 17.50% | 23.50% | 20.60%
Tax settlement, amount |  | $ (14.9) |  | $ (14.9)
Tax settlement, effective tax rate |  | (3.30%) |  | (1.70%)
Excess tax benefit from option exercises | $ 7.5 | $ 19.3 | $ 11.3 | $ 22.0
Excess tax benefit, impact on effective tax rate | (1.20%) | (4.30%) | (1.00%) | (2.50%)
Impact of acquisition-related expenses on the effective tax rate |  | 0.60% |  | 0.30%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 + Details
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