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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 6 Months Ended | 29 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 23, 2018 | Jul. 27, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Aug. 29, 2018
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Cash dividends declared per Class A and Class B share (in dollars per share) | $ 0.29 |  |  |  |
Dividends payable |  |  |  |  | $ 7.0
Class A common stock |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Shares repurchased pursuant to repurchase authorizations (in shares) |  |  | 640,586 | 1,683,311 |
Class A common stock | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Shares repurchased pursuant to repurchase authorizations (in shares) |  | 226,910 |  |  |
Average purchase price per share (in dollars per share) |  | $ 86.65 |  |  |
2016 Share Repurchase Authorization | Class A common stock |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Remaining authorized repurchase amount |  |  | $ 98.6 | $ 98.6 |
2016 Share Repurchase Authorization | Class A common stock | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Remaining authorized repurchase amount |  | $ 78.9 |  |  |

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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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