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Segment Data - Segment Information by Geographical Region (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from services	$ 20,724.4	$ 18,001.0	$ 20,863.5
United States Plans
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from services	2,743.3	2,327.2	2,590.6
Long-Lived Assets	76.9	73.9	100.8
France
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from services	5,171.3	4,338.1	5,479.6
Long-Lived Assets	135.0	147.8	157.4
Italy
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from services	1,795.4	1,370.7	1,508.3
Long-Lived Assets	33.6	36.0	35.1
United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from services	1,733.0	1,402.9	1,598.6
Long-Lived Assets	25.2	25.8	30.6
Total Foreign
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from services	17,981.1	15,673.8	18,272.9
Long-Lived Assets	$ 451.5	$ 481.1	$ 498.6

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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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