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Balance Sheet Components (Trade Accounts Payable) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Accounts Payable, Current [Abstract]    
Trade accounts payable $ 1,083.2 $ 1,123.2
Other payables 428.1 493.8
Accounts payable $ 1,511.3 $ 1,617.0