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Other Current Assets (Schedule of Other Current Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Other Current Assets    
Advances against auction contracts $ 13.7 $ 8.9
Assets held for sale   0.3
Prepaid expenses and deposits 70.6 38.9
Derivative financial asset   $ 0.2
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]   Other Current Assets
Other Current Assets $ 84.3 $ 48.3