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Joint Ventures Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 99.4 $ 116.7
Noncurrent assets 168.0 183.6
Current liabilities 43.1 65.3
Long-term liabilities 88.4 100.9
Stockholder's equity $ 135.9 $ 134.1