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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
leases [Abstract]    
Right-of-use assets $ 4.5 $ 5.6
Commitments [Table]    
Interest expense on lease liabilities 0.2 0.3
Expense relating to short-term leases for which recognition exemption has been used 5.8 2.7
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 78.2 98.1
Lease liabilities 84.3 101.2
Cash outflow for leases $ 84.6 $ 103.3