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PROPERTY AND EQUIPMENT. (Owned) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,596.9	$ 1,435.5
Less accumulated depreciation and amortization	944.9	820.4
Total	652.0	615.1
Computer and communications software and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	824.4	704.0
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	442.5	422.0
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	121.0	108.2
Furniture and other equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	168.9	158.3
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	37.4	40.3
Leased land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2.7	2.7
Compensation and related costs attributable to the development of computer software for internal use [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, additions	$ 62.3	$ 28.9	$ 22.3

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: 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(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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