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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

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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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

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Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased and retired during the period.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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