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Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]  
ROU Assets
The following table presents ROU assets obtained in exchange for lease obligations (in millions):
 
 
Nine Months Ended September 30,
 
 
2020
 
2019
ROU assets obtained in exchange for lease obligations:
 
 
 
 
Operating leases, initial recognition
 
$
3.4

 
$
18.2

Operating leases, modifications and remeasurements
 
$
10.0

 
$
(9.5
)
Finance leases, initial recognition
 
$
13.8

 
$
14.0

Finance leases, modifications and remeasurements
 
$
31.8

 
$
8.2