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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]        
Cash paid for income taxes $ 1.8 $ 1.8 $ 4.6 $ 1.0
Cash paid for interest 5.2 0.0 4.4 9.5
Cash received for income tax receivables 0.0 0.0 90.0 0.0
Establishment of operating lease right-of-use assets and lease liabilities        
Operating lease right-of-use assets 0.0 46.9 41.8 74.5
Operating lease liabilities 0.0 (46.9) (48.1) (78.8)
Tenant improvement allowance not yet received 0.0 22.9 0.0 0.0
Purchases of property, plant and equipment in accounts payable and accrued liabilities 0.0 10.0 0.0 0.0
Accrued liabilities and other long-term liabilities $ 0.0 $ 0.0 $ 0.0 $ 4.3