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Commitments and Contingencies - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) renewal_term | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items] |  |  |
Rent expense | $ | $ 59.6 | $ 53.1 | $ 43.8
Towers |  |  |
Operating Leased Assets [Line Items] |  |  |
Number of renewals | renewal_term | 4 |  |
Term of renewals | 5 years |  |
Towers | Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Terms of leases | 5 years |  |
Towers | Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Terms of leases | 10 years |  |
Other | Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Terms of leases | 5 years |  |
Other | Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Terms of leases | 20 years |  |

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