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Balance Sheet Components (Trade Accounts Payable) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accounts Payable, Current [Abstract]    
Accounts Payable, Trade $ 963.7 $ 976.0
Accounts Payable, Other 437.4 476.5
Accounts Payable, Trade, Current $ 1,401.1 $ 1,452.5