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Debt (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Debt Instruments
Debt at June 30, 2022 and December 31, 2021 was as follows (in millions): 
June 30,
2022		December 31,
2021
ATI Inc. 5.875% Notes due 2027
350.0 350.0 
ATI Inc. 5.125% Notes due 2031
350.0 350.0 
ATI Inc. 4.875% Notes due 2029
325.0 325.0 
ATI Inc. 3.5% Convertible Senior Notes due 2025
291.4 291.4 
ATI Inc. 4.75% Convertible Senior Notes due 2022
— 84.2 
Allegheny Ludlum 6.95% Debentures due 2025 (a)
150.0 150.0 
Term Loan due 2024200.0 200.0 
U.S. revolving credit facility— — 
Foreign credit facilities12.7 27.4 
Finance leases and other75.7 85.7 
Debt issuance costs(18.9)(20.8)
Debt1,735.9 1,842.9 
Short-term debt and current portion of long-term debt32.6 131.3 
Long-term debt$1,703.3 $1,711.6 
 
(a) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed by ATI.
Interest Income and Interest Expense Disclosure Interest expense on the 2025 Convertible Notes was as follows:
Three months ended June 30,Six months ended June 30,
(in millions)2022202120222021
Contractual coupon rate$2.6 $2.5 $5.1 $5.1 
Amortization of debt issuance costs0.5 0.4 0.9 0.8 
   Total interest expense$3.1 $2.9 $6.0 $5.9 
Interest expense on the 2022 Convertible Notes was as follows:
Three months ended June 30,Six months ended June 30,
(in millions)2022202120222021
Contractual coupon rate$1.0 $1.0 $2.0 $2.0 
Amortization of debt issuance costs0.2 0.1 0.3 0.2 
   Total interest expense$1.2 $1.1 $2.3 $2.2