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Restricted Cash (Tables)
 9 Months Ended
Sep. 30, 2019
Restricted Cash [Abstract]  
Restricted Cash
 
 
As of
(in millions)
 
September 30, 2019
 
September 30, 2018
 
December 31, 2018
Cash and cash equivalents
 
$
58.3

 
$
56.7

 
$
52.7

Restricted cash
 
5.4

 
1.4

 
1.4

Cash, cash equivalents and restricted cash
 
$
63.7

 
$
58.1

 
$
54.1