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Asset Retirement Obligation
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Asset Retirement Obligation

The following table sets forth the change in the asset retirement obligations associated with our advertising structures located on leased properties. The obligation is calculated based on the assumption that all of our advertising structures will be removed within the next 50 years. The estimated annual costs to dismantle and remove the structures upon the termination or non-renewal of our leases are consistent with our historical experience.
 
 
Year Ended December 31,
(in millions)
 
2019
 
2018
Balance, at beginning of period
 
$
34.2

 
$
34.7

Accretion expense
 
2.5

 
2.4

Additions
 
0.3

 
0.2

Liabilities settled
 
(2.1
)
 
(2.7
)
Foreign currency translation adjustments
 
0.2

 
(0.4
)
Balance, at end of period
 
$
35.1

 
$
34.2