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Summary of Significant Accounting Policies, Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property and Equipment [Abstract]
Depreciation expense	$ 164.2	$ 169.3	$ 157.6
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	1,649.0	1,470.1
Total accumulated depreciation	(909.1)	(806.2)
Net property and equipment	740.0	663.9
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 132.5	127.9
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	$ 886.9	829.8
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	$ 396.0	352.4
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
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 233.6	$ 160.0
Automobiles [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	2 years
Automobiles [Member] | 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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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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