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Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventories    
Raw materials $ 21.1 $ 24.3
Work-in-progress 29.1 28.0
Finished goods 43.2 48.7
Total inventories $ 93.4 $ 101.0