Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

DEBT - Schedule of long-term debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 29, 2017	Jan. 12, 2017
Debt Instrument
Total debt	$ 1,214.1	$ 1,237.9
Term Loan Agreement
Debt Instrument
Total debt	270.4
Prior Term Loan Agreement
Debt Instrument
Total debt		294.9
3.650% Senior Notes
Debt Instrument
Total debt	644.2	$ 643.8
Interest rate		3.65%		3.65%
1.950% Senior Notes
Debt Instrument
Total debt	299.5	$ 299.2
Interest rate		1.95%	1.95%
Revolving Credit Agreement
Debt Instrument
Total debt	$ 0.0