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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Supplemental Cash Flow Elements [Abstract]    
Cash paid during the period for income taxes $ 1.0 $ 1.7
Cash paid for interest 0.0 1.7
Cash received for income tax receivables 0.0 89.9
Establishment of operating lease right-of-use assets and lease liabilities    
Operating lease right-of-use assets 15.5 40.5
Operating lease liabilities 15.5 46.7
Tenant improvement allowance not yet received 16.0 0.0
Purchases of property, plant and equipment in accounts payable and accrued liabilities $ 4.3 $ 0.0