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Accrued and Other Current Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Non-income taxes payable $ 83.9 $ 75.7
Accrued legal and other external fees 34.2 28.1
Deferred rent 0.0 41.0
Income taxes payable (0.1) 0.3
Other accrued and current liabilities 30.8 19.4
Total accrued and other current liabilities $ 148.8 $ 164.5