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Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Feb. 11, 2021	Nov. 06, 2020	Jul. 27, 2018	Feb. 28, 2018
Subsequent Event [Line Items]
Share repurchase authorized amount			$ 100.0
Class A common stock
Subsequent Event [Line Items]
Share repurchase authorized amount		$ 100.0		$ 50.0
Class A common stock | Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.24
Company repurchased ( in shares)	2.1
Value of stock repurchased	$ 49.9
Remaining capacity for future purchases of shares	120.0
Class A common stock | Subsequent Event | Minimum
Subsequent Event [Line Items]
Share repurchase authorized amount	70.0
Class A common stock | Subsequent Event | Maximum
Subsequent Event [Line Items]
Share repurchase authorized amount	$ 170.0
Class B common stock | Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.24

X

- 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=120397183&loc=d3e187085-122770

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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- Definition

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

No definition available.

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- Definition

The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29,30)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: 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

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