QUARTERLY FINANCIAL DATA - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016	Mar. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Tax reform, additional tax expense from remeasurement from reduced tax rate	$ 13.6
After-tax compliance resolution expense		$ 3.1	$ 3.7
Business acquisition, transaction costs				$ 4.1

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

No definition available.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant