Unconsolidated Affiliate Companies (Details) - Joint Ventures - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unconsolidated Affiliate Companies
Ownership percentage	50.00%
Net investment	$ 22.5	$ 22.5
Current assets	81.0	81.8
Non-current assets	15.3	18.6
Total liabilities	55.4	59.0
Equity	40.9	41.4
Net sales	212.6	220.5	$ 195.1
Gross profit	147.2	147.8	129.9
Income from operations	44.6	46.6	43.3
Net income	$ 32.4	$ 33.5	$ 31.7

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