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Segment Data - Segment Information by Geographical Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services	$ 5,637.5	$ 5,464.8	$ 5,174.8	$ 4,757.2	$ 4,956.1	$ 5,088.2	$ 5,022.1	$ 4,587.7	$ 21,034.3	$ 19,654.1	$ 19,329.9
Long-Lived Assets	161.3				150.6				161.3	150.6	152.2
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									2,758.5	2,950.2	3,115.6
Long-Lived Assets	24.9				33.9				24.9	33.9	32.3
France
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									5,493.9	4,857.3	4,684.1
Long-Lived Assets	49.1				40.9				49.1	40.9	40.4
Italy
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									1,479.4	1,170.7	1,230.2
Long-Lived Assets	4.9				4.4				4.9	4.4	4.7
United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									1,619.2	1,819.7	2,118.4
Long-Lived Assets	9.1				9.0				9.1	9.0	10.3
Total Foreign
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									18,275.8	16,703.9	16,214.3
Long-Lived Assets	$ 136.4				$ 116.7				$ 136.4	$ 116.7	$ 119.9

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

No definition available.

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