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Quarterly report pursuant to Section 13 or 15(d)

ASSET RETIREMENT OBLIGATIONS - Asset Retirement Obligation Disclosure (Details)

v3.20.2
ASSET RETIREMENT OBLIGATIONS - Asset Retirement Obligation Disclosure (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Asset Retirement Obligation [Roll Forward] Ìý Ìý
Asset retirement obligation at beginning of period $ 165.3 $ 172.4
Increase from AK Steel acquisition 16.7 0.0
Accretion expense 7.8 7.6
Remediation payments (3.4) (0.5)
Asset retirement obligation at end of period $ 186.4 $ 179.5