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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Unrecognized tax benefits [Roll Forward]    
Balance as of beginning of period $ 84.5 $ 71.7
Additions based on tax positions related to current period 2.5 3.9
Additions for tax positions of prior years 21.2 11.4
Expiration of statutes of limitations 0.0 0.0
Settlements of uncertain tax positions with tax authorities (4.4) (2.5)
Balance as of end of period $ 103.8 $ 84.5