Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

EQUITY - Treasury Stock - Share Repurchase Program (Details) - Common Class A - USD ($)	Jun. 30, 2019	Feb. 03, 2016
Class of Stock [Line Items]
Amount remaining under current repurchase program	$ 396,800,000
Incremental Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount		$ 500,000,000.0