SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for doubtful accounts — Trade receivables (Continuing operations) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at beginning of period | $ 74.2 | $ 56.1 | $ 60.8 |
| Impact of the adoption of ASU 2014-09 | 11.9 | 0.0 | 0.0 |
| Additions to costs and expenses | 61.6 | 51.6 | 50.9 |
| Acquisitions | 0.0 | 1.5 | 3.8 |
| VodafoneZiggo JV Transaction | 0.0 | 0.0 | (13.0) |
| Deductions or write-offs | (98.4) | (41.7) | (39.3) |
| Foreign currency translation adjustments | (3.5) | 6.7 | (7.1) |
| Balance at end of period | $ 45.8 | $ 74.2 | $ 56.1 |