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ASSET RETIREMENT OBLIGATIONS (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation [Abstract]  
Carrying value of asset retirement obligations

The changes in the carrying amount of the Company’s asset retirement obligations were as follows:
 
2019
 
2018
Beginning balance as of January 1,
$
1,210.0

 
$
1,175.3

Additions
61.8

 
39.6

Accretion expense
81.6

 
83.6

Revisions in estimates (1)
56.8

 
(81.5
)
Settlements
(26.1
)
 
(7.0
)
Balance as of December 31,
$
1,384.1

 
$
1,210.0

 
_______________
(1)
Revisions in estimates include decreases to the liability of $6.7 million and $49.4 million related to foreign currency translation for the years ended December 31, 2019 and 2018, respectively.