Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Taxes
Provision for income taxes	$ (150.4)	$ (120.5)	$ (429.2)	$ (302.8)
Effective tax rate	23.10%	22.20%	23.40%	21.20%
Tax settlement, amount				$ (14.9)
Tax settlement, effective tax rate				(1.00%)
Excess tax benefit from option exercises	$ 10.6	$ 12.3	$ 21.9	$ 34.3
Excess tax benefit, impact on effective tax rate	(1.60%)	(2.30%)	(1.20%)	(2.40%)
Impact of acquisition-related expenses on the effective tax rate	0.20%		0.10%	0.20%

Represents the basis point impact to the effective tax rate relating to the acquisition-related expenses.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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.

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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.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount 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.

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