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Property and Equipment, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Imputed financing lease obligation	$ 25.5
Property and equipment, gross	874.5	$ 846.7
Accumulated depreciation	563.9	504.8
Depreciation	158.6	170.7	$ 173.8
Building
Property, Plant and Equipment [Line Items]
Gross building asset, derecognized	36.6
Accumulated depreciation, derecognized	12.2
Property and equipment, gross	0.0	36.6
Infrastructure Assets Held under Capital Leases
Property, Plant and Equipment [Line Items]
Property and equipment, gross	362.8	417.9
Accumulated depreciation	211.7	$ 259.0
Accrued and other current liabilities
Property, Plant and Equipment [Line Items]
Imputed financing lease obligation	2.8
Other Noncurrent Liabilities
Property, Plant and Equipment [Line Items]
Imputed financing lease obligation	$ 22.7

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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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-Publisher FASB
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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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