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Schedule of Change in Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
A reconciliation of our AROs is as follows:
(in millions)
March 31, 2020
 
December 31, 2019
AROs, beginning of period
$
1,315.2

 
$
1,160.1

Liabilities incurred
3.4

 
15.8

Liabilities settled
(22.5
)
 
(112.8
)
Accretion expense
17.3

 
62.4

Revisions in estimated cash flows
1.2

 
191.0

Foreign currency translation
(53.9
)
 
(1.3
)
AROs, end of period
1,260.7

 
1,315.2

Less current portion
(147.5
)
 
(154.4
)
Non-current portion of AROs
$
1,113.2

 
$
1,160.8