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Balance Sheet Components (Trade Accounts Payable) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Accounts Payable, Current [Abstract]    
Accounts Payable, Trade $ 732.9 $ 939.5
Accounts Payable, Other 400.5 408.6
Accounts Payable, Trade, Current $ 1,133.4 $ 1,348.1