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Stockholders' Equity - Dividends Declared and Paid (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared per Class A and Class B share (in dollars per share) | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.27 | $ 0.27 | $ 0.27 | $ 0.27 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.2
Total amount of dividends paid (in millions) | $ 6.8 | $ 7.0 | $ 7.2 | $ 6.7 | $ 6.7 | $ 6.7 | $ 6.8 | $ 6.3 | $ 6.3 | $ 6.3 | $ 6.4 | $ 5.1

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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