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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes in Carrying Values of Asset Retirement Obligations The following table reflects changes in the carrying values of asset retirement obligations:

 

 

 

March 31,

2020

 

 

December 31,

2019

 

(Dollars in millions)

 

 

 

 

 

 

 

 

Asset retirement obligation at beginning of year

 

$

20.7

 

 

$

27.0

 

Accretion expense

 

 

0.3

 

 

 

1.5

 

Revision in estimated cash flows

 

 

0.2

 

 

 

4.7

 

Cash expenditures

 

 

(1.7

)

 

 

(12.5

)

Currency translation

 

 

(0.1

)

 

 

0.0

 

Balance at end of period

 

$

19.4

 

 

$

20.7