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Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Restricted Cash [Abstract]          
Cash and cash equivalents $ 474.8 $ 52.7 $ 41.7    
Restricted cash 1.4 1.4 0.0    
Cash, cash equivalents and restricted cash $ 476.2 $ 54.1 $ 41.7 $ 41.7 $ 48.3