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Summary of Significant Accounting Policies, Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property and Equipment [Abstract]
Depreciation expense	$ 168.7	$ 157.7	$ 164.2
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	1,653.0	1,543.4
Total accumulated depreciation	(1,039.1)	(960.5)
Net property and equipment	613.9	582.9
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 145.4	138.7
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	13 years
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 987.9	932.2
Computer equipment and software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	2 years
Computer equipment and software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	7 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 468.2	431.2
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	15 years
Property, Plant and Equipment, Other Types
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 51.5	$ 41.3
Property, Plant and Equipment, Other Types | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	2 years
Property, Plant and Equipment, Other Types | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	30 years

X

- Definition

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

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of 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, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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