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Income Taxes (Components of Net Deferred Tax Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Deferred tax assets $ 2,457.4 $ 2,488.2 $ 3,117.1 $ 3,133.1
Deferred tax liabilities (246.4) (232.9)    
Net deferred tax asset $ 2,211.0 $ 2,255.3