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Income Taxes - Schedule of Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Currently payable      
U.K. $ (0.2) $ 0.7 $ 0.4
International 2.3 2.9 6.4
Total current taxes 2.1 3.6 6.8
Deferred      
U.K. 2.1 4.5 2.9
International 2.7 (0.5) (3.2)
Total deferred taxes 4.8 4.0 (0.3)
Total provision for income taxes $ 6.9 $ 7.6 $ 6.5