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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions			6 Months Ended
	Jan. 21, 2019	Jul. 19, 2017	Jun. 30, 2019	Apr. 02, 2015
Robtec
Business Acquisition [Line Items]
Acquired ownership percentage			70.00%
Easyway
Business Acquisition [Line Items]
Acquired ownership percentage	30.00%	5.00%	100.00%	65.00%
Value of voting rights acquired	$ 13.5	$ 2.3
Purchase of noncontrolling interest			$ 2.5

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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