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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Schedule of Lease Cost Components
The following represents the components of lease cost and other information for both operating and financing leases for the years ending December 31, 2021, 2020 and 2019:
($ in millions)Year ended
December 31, 2021December 31, 2020December 31, 2019
Lease Cost
Finance Lease Cost:
   Amortization of right of use asset$7.1 $3.5 $1.7 
   Interest on lease liabilities3.1 1.0 0.5 
Operating lease cost22.7 20.8 20.5 
Short-term lease cost1.6 1.9 3.1 
Variable lease cost0.9 0.9 0.8 
Sublease income(0.3)(0.1)— 
Total lease cost$35.1 $28.0 $26.6 
Other information
Cash paid for amounts included in the measurement of lease liabilities
   Operating cash flows from finance leases$3.0 $1.0 $0.5 
   Operating cash flows from operating leases$20.0 $21.7 $20.8 
   Financing cash flows from finance leases$14.3 $6.2 $2.4 
Right of use assets obtained in exchange for new finance lease liabilities$58.9 $42.3 $14.1 
Right of use assets obtained in exchange for new operating lease liabilities (a)$4.8 $12.4 $35.9 
Weighted average remaining lease term - finance leases5 years4 years4 years
Weighted average remaining lease term - operating leases5 years6 years6 years
Weighted average discount rate - finance leases5.2 %6.2 %5.3 %
Weighted average discount rate - operating leases6.5 %6.9 %7.0 %
(a) Several of the Company’s real property lease contracts include options to extend the lease term. The Company reassesses the likelihood of exercising renewal clauses on at least an annual basis. For the year ended December 31, 2019, ATI recorded $10.2 million of additional ROU assets and lease liabilities for likely renewals at certain leased locations.
Schedule of Operating Lease Liability Maturities
The following table reconciles future minimum undiscounted rental commitments for operating leases to the operating lease liabilities recorded on the consolidated balance sheet as of December 31, 2021 (in millions):
December 31, 2021
2022$17.2 
202313.1 
20249.8 
20257.9 
20265.6 
2027 and thereafter12.4 
Total undiscounted lease payments$66.0 
Present value adjustment (11.6)
Operating lease liabilities$54.4 
Schedule of Finance Lease Liability Maturities
The following table reconciles future minimum undiscounted rental commitments for finance leases to the finance lease liabilities recorded on the consolidated balance sheet as of December 31, 2021 (in millions):
December 31, 2021
2022$23.4 
202322.5 
202418.9 
202514.4 
20267.7 
2027 and thereafter8.5 
Total undiscounted lease payments$95.4 
Present value adjustment (10.8)
Finance lease liabilities$84.6