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Balance Sheet Details - Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Information Disclosure [Abstract]    
Accounts receivable $ 233.9 $ 145.8
Less allowance for doubtful accounts (7.2) (11.5)
Total accounts receivable, net $ 226.7 $ 134.3