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Changes in Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Dividends declared per share | $ 0.18 |  | $ 0.17 | $ 0.36 | $ 0.34 |
Common Class A [Member] |  |  |  |  |  |
Dividends declared per share |  |  |  | 0.18 | 0.17 |
Common Class B [Member] |  |  |  |  |  |
Dividends declared per share |  |  |  | $ 0.18 | $ 0.17 |
Common Class B [Member] | Standish Family Holdings, LLC [Member] |  |  |  |  |  |
Conversion of stock | 1.6 |  |  |  |  |
ASC 606 [Member] |  |  |  |  |  |
Increase decrease in retained earnings |  |  |  |  |  | $ 5.6
Increase decrease in non controlling interest |  |  |  |  |  | 0.3
ASU 2016-16 [Member] |  |  |  |  |  |
Increase decrease in retained earnings |  |  |  |  |  | $ 0.5
ASC 842 [Member] |  |  |  |  |  |
Increase decrease in retained earnings |  | $ 0.1 |  |  |  |

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