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Reporting and Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Income taxes $ 715.6 $ 459.4 $ 701.8
Interest $ 146.3 $ 139.2 $ 132.0