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Joint Ventures - China Joint Ventures (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]                      
Net sales $ 279.4 $ 279.3 $ 254.2 $ 261.5 $ 238.5 $ 256.4 $ 269.9 $ 258.0 $ 1,074.4 $ 1,022.8 $ 1,041.3
Gross profit 79.5 80.2 74.3 74.3 70.9 72.2 79.0 67.9 308.3 290.0 278.5
Net income $ 15.3 $ 24.5 $ 21.5 $ 22.5 $ 20.2 $ 27.7 $ 20.5 $ 17.4 83.8 85.8 94.5
Joint venture | China                      
Schedule of Equity Method Investments [Line Items]                      
Net sales                 101.3 103.5 109.7
Gross profit                 33.0 32.2 33.4
Net income                 $ 9.7 $ 8.3 $ 7.4