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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment	$ 809.7	$ 770.3
Less: accumulated depreciation and amortization	(552.4)	(511.7)
Property and equipment, net	257.3	258.6
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 464.1	434.8
Estimated useful life	3 years
Software
Property, Plant and Equipment [Line Items]
Property and equipment	$ 64.8	55.9
Software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Land
Property, Plant and Equipment [Line Items]
Property and equipment	$ 9.0	9.0
Buildings, including improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 146.6	145.5
Buildings, including improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Buildings, including improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 98.2	99.4
Other
Property, Plant and Equipment [Line Items]
Property and equipment	$ 27.0	$ 25.7
Other | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	1 year
Other | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	20 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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- Definition

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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