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Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment	$ 263.3	$ 238.7
Less: accumulated depreciation	193.9	165.0
Total	69.4	73.7
Depreciation	38.0	40.1	$ 36.5
Cost of Sales [Member]
Property, Plant and Equipment [Line Items]
Depreciation	4.6	10.3	7.7
Selling, General and Administrative Expenses
Property, Plant and Equipment [Line Items]
Depreciation	33.4	29.8	$ 28.8
Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	201.6	180.2
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	28.0	26.8
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	28.9	24.7
Work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 4.8	$ 7.0

X

- Definition

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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- Definition

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 of accumulated depreciation of long-lived, physical assets used to produce goods and services and not intended for resale, classified as other.

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