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Recent Accounting Pronouncements (Recently Adopted Accounting Standards) (Income Taxes) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 49,106.7   $ 48,325.8
Accounting Standards Update 2016-06 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings   $ 57.0