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New Accounting Standards Effect of Standard Change (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Property, Plant and Equipment [Line Items]      
Other assets $ 744.1 $ 768.4 $ 757.8
Software and Software Development Costs [Member]      
Property, Plant and Equipment [Line Items]      
Other assets $ 21.7