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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
leases [Abstract]    
Right-of-use assets $ 3.9 $ 4.5
Commitments [Table]    
Interest expense on lease liabilities 0.2 0.2
Expense relating to short-term leases for which recognition exemption has been used 7.8 5.8
Expense relating to leases of low-value assets for which recognition exemption has been used 0.1 0.1
Expense relating to variable lease payments not included in measurement of lease liabilities 63.1 78.2
Lease liabilities 71.2 84.3
Cash outflow for leases $ 70.9 $ 84.6