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Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
Equity Method Investments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investments [Abstract]
Income From Equity Method Investments	$ 8.9	$ 3.5	$ 5.4
Equity method investments, share of net assets	$ 42.9	$ 40.7

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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