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Segment Data - Segment Information by Geographical Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services	$ 5,196.6	$ 5,248.9	$ 5,373.1	$ 5,044.9	$ 5,393.2	$ 5,418.7	$ 5,656.9	$ 5,522.4	$ 20,863.5	$ 21,991.2	$ 21,034.3
Long-Lived Assets	150.9				160.0				150.9	160.0	161.3
United States Plans
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									2,590.6	2,608.9	2,758.5
Long-Lived Assets	20.5				22.4				20.5	22.4	24.9
France
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									5,479.6	5,846.4	5,493.9
Long-Lived Assets	46.9				50.1				46.9	50.1	49.1
Italy
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									1,508.3	1,673.9	1,479.4
Long-Lived Assets	5.2				5.0				5.2	5.0	4.9
United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									1,598.6	1,672.1	1,619.2
Long-Lived Assets	5.8				7.0				5.8	7.0	9.1
Total Foreign
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									18,272.9	19,382.3	18,275.8
Long-Lived Assets	$ 130.4				$ 137.6				$ 130.4	$ 137.6	$ 136.4

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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.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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