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Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details)

v3.20.2
DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 24, 2020
Mar. 27, 2020
Mar. 13, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount $ 736.4 Ìý Ìý $ 747.6 $ 714.0 $ 1,487.5 $ 724.0
Reduction of Principal Long-Term Debt $ 181.2 Ìý Ìý Ìý Ìý Ìý Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 129.4 (17.9) 132.6 (18.2)
Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý 11.2 Ìý Ìý Ìý
7.625% 2021 AK Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý $ 8.5 $ 364.2 0.0 Ìý 372.7 Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 0.0 Ìý 0.4 Ìý
7.50% 2023 AK Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý $ 56.5 $ 310.7 0.0 Ìý 367.2 Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 0.0 Ìý 2.8 Ìý
4.875% 2024 Senior Secured Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý 5.5 Ìý 5.5 Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 0.5 Ìý 0.5 Ìý
6.375% 2025 Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý 167.5 Ìý 167.5 Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 21.3 Ìý 21.3 Ìý
1.50% 2025 Convertible Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý 20.0 Ìý 20.0 Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 1.3 Ìý 1.3 Ìý
4.875% 2021 Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý Ìý 114.0 Ìý 124.0
Gain (loss) on extinguishment of debt Ìý Ìý Ìý Ìý (5.0) Ìý (5.3)
5.75% 2025 Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý 77.1 600.0 77.1 600.0
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 16.3 $ (12.9) 16.3 $ (12.9)
7.00% 2027 Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý 247.3 Ìý 247.3 Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 28.4 Ìý 28.4 Ìý
5.875% 2027 Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý 194.5 Ìý 194.5 Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 48.7 Ìý 48.7 Ìý
6.25% 2040 Senior Notes [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý 35.7 Ìý 35.7 Ìý
Gain (loss) on extinguishment of debt Ìý Ìý Ìý 12.9 Ìý $ 12.9 Ìý
AK Steel Holding Corporation [Member] | Unsecured Industrial Revenue Bonds [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Extinguishment of Debt, Amount Ìý Ìý Ìý $ 7.3 Ìý Ìý Ìý