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Commitments and Contingent Liabilities, Consolidated Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Consolidated Lease Expense [Abstract]      
Non-cash lease expense (amortization of ROU assets) $ 40.6 $ 39.0 $ 42.8
Related accretion expense on lease liability balances 12.2 13.0 9.0
Total fixed lease expense 52.8 52.0 51.8
Variable lease expense 1.1 0.2 6.2
Subtotal operating lease expense 53.9 52.2 58.0
Short-term operating leases 54.5 49.8 48.6
Total operating lease expense 108.4 102.0 106.6
Cash payments for operating lease liabilities 40.0 37.1 48.1
Operating lease income $ 12.3 $ 11.4 $ 14.4