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Subsequent Events (Details) - Common shares - USD ($) shares in Millions, $ in Millions		9 Months Ended
	Oct. 13, 2021	Sep. 30, 2021	Sep. 30, 2020	Oct. 27, 2021	Oct. 01, 2021
Subsequent Event [Line Items]
Treasury stock, shares acquired (shares)		22.8	2.6
Shares repurchased for treasury		$ 872.2	$ 75.5
Remaining authorized repurchase amount		$ 44.3
Subsequent Event
Subsequent Event [Line Items]
Share repurchase authorization, amount					$ 1,500.0
Treasury stock, shares acquired (shares)	1.2
Shares repurchased for treasury	$ 45.5
Remaining authorized repurchase amount				$ 1,500.0

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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