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Accounting Standards and Policies (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in debt		$ 2,491.8	$ 2,312.1
Increase in retained earnings		4,391.5	4,005.5
Decrease in additional paid-in-capital		(556.0)	(728.9)
Decrease in deferred income tax liability (net)		$ (513.9)	$ (423.4)
Accounting Standards Update 2020-06 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in debt	$ 102.4
Increase in retained earnings	4.6
Decrease in additional paid-in-capital	81.4
Decrease in deferred income tax liability (net)	$ 25.6

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