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Summary Of Significant Accounting Policies (Schedule of Prospective Adoption of New Accounting Pronouncements) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Selling, general and administrative expenses $ 1,159.9 $ 1,125.0 $ 1,026.6
Non-operating expenses $ 23.7 $ 30.6 24.8
As Reported      
Selling, general and administrative expenses     1,047.2
Non-operating expenses     4.2
Reclassification      
Selling, general and administrative expenses     (20.6)
Non-operating expenses     $ 20.6