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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Management fee, percentage | 8.00% |  |
Service fee retained by Sprint | 8.60% |  |
Management fee on prepaid wireless revenues and costs | 6.00% |  |
Wireless contract asset balance | $ 65.7 |  | $ 51.1
Payments to increase wireless contract asset balance | 61.2 |  |
Amortization to reduce revenue | $ 46.6 |  |
Revenue recorded from equipment financing transactions |  | $ 63.8 |
Estimated customer life (in months) | 42 months |  |
Cost to fulfill contract | $ 10.1 |  |
Amortization of capitalized costs to fulfill contracts | $ 5.5 |  |
Cable |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Installation revenue, recognition period | 10 months |  |
Commissions and other costs, recognition period (in months) | 44 months |  |
Wireline |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Installation revenue, recognition period | 11 months |  |
Commissions and other costs, recognition period (in months) | 72 months |  |
Enterprise |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Commissions and other costs, recognition period (in months) | 46 months |  |
Prepaid expenses and other |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cost to fulfill contract | $ 4.6 |  |
Deferred charges and other assets, net |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cost to fulfill contract | $ 5.5 |  |
Cost of Goods and Services Sold |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reimbursement payments, cost of equipment and commissions |  | 63.5 |
Selling, General and Administrative Expenses |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reimbursement payments, cost of equipment and commissions |  | $ 16.9 |
Minimum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reimbursement payment, cost of equipment and commissions, benefit period for recognition | 21 months |  |
Maximum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reimbursement payment, cost of equipment and commissions, benefit period for recognition | 53 months |  |

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