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Property and Equipment, Net - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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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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