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New Accounting Guidance - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Oct. 01, 2019
Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 534.8   $ 0.0
Operating lease liabilities 621.0   $ 0.0
ASU 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   $ 274.5  
Operating lease liabilities   315.2  
Adjustment to ROU asset upon Adoption of ASC 842   $ (40.7)  
ASU 2016-13 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment to retained earnings $ 6.0