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Per Common Share Information (Additional Information) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Dilutive effect of share-based compensation	5.5	5.5	5.4	5.4
Stock options that were not included in diluted weighted-average shares	1.4	1.8	3.0	1.9
Dividends Payable, Amount Per Share					$ 1.38
Dividends payable	$ 1,027.3		$ 1,027.3			$ 0.0
Dividends Payable	$ 1,000.0		$ 1,000.0

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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