Increase decrease in retained earnings.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Aggregate number of common shares reserved for future issuance.

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- Definition

Face amount or stated value per share of common stock.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Aug. 31, 2006
ASC 606 [Member]
Class of Stock [Line Items]
Increase decrease in retained earnings			$ 5.6
Increase decrease in non controlling interest			0.3
ASU 2016-16 [Member]
Class of Stock [Line Items]
Increase decrease in retained earnings			$ 0.5
ASC 842 [Member]
Class of Stock [Line Items]
Increase decrease in retained earnings		$ 0.1
Common Class A [Member]
Class of Stock [Line Items]
Dividends declared per share amount		$ 0.69	$ 0.68	$ 0.73
Common Stock, par value per share		0.001		$ 0.001
Common Stock reserved for the conversion of Class B Common Stock and the exercise of stock options				1.6
Number of shares authorized to be repurchased					2.0
Common Class A [Member] \| Public offering [Member] \| Number of Shares Reduced [Member]
Class of Stock [Line Items]
Common Stock reserved for the conversion of Class B Common Stock and the exercise of stock options				1.6
Common Class B [Member]
Class of Stock [Line Items]
Dividends declared per share amount		0.69	$ 0.68	$ 0.73
Common Stock, par value per share		$ 0.001		$ 0.001
Common Class B [Member] \| Standish Family Holdings, LLC [Member]
Class of Stock [Line Items]
Conversion of stock	1.6