Basis of Presentation and Accounting Policies - Recently Issued Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions	Oct. 01, 2019	Sep. 30, 2022	Sep. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 321.0	$ 377.7
Total lease liabilities		$ 346.5
Accounting Standards Update 2018-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax cuts and jobs act, reclassification from AOCI to retained earnings, tax effect	$ 147.0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	316.0
Total lease liabilities	$ 329.0