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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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