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Operations and Summary of Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Total assets $ 7,759.7 $ 7,626.4 $ 7,971.7
Total liabilities $ 4,852.7 $ 4,632.9