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Joint Ventures - Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]        
Current assets $ 396.4 $ 427.5    
Current liabilities 166.9 157.6    
Accumulated other comprehensive loss 649.6 597.7 $ 557.9 $ 546.7
Joint venture | China        
Schedule of Equity Method Investments [Line Items]        
Current assets 110.0 99.4    
Noncurrent assets 166.6 168.0    
Current liabilities 67.6 43.1    
Long-term liabilities 60.2 88.4    
Accumulated other comprehensive loss $ 148.8 $ 135.9