Segment Reporting (Summary of Impact on the Adjusted OBIDA) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Segment Reporting Information [Line Items] | |||
| Adjusted OIBDA | $ 0.0 | $ 0.0 | $ 0.0 |
| Revenue | 11,541.5 | 11,957.9 | 11,276.4 |
| Operating Segments | U.K./Ireland | |||
| Segment Reporting Information [Line Items] | |||
| Adjusted OIBDA | (66.6) | (61.7) | (52.8) |
| Operating Segments | Switzerland | |||
| Segment Reporting Information [Line Items] | |||
| Adjusted OIBDA | (33.0) | (36.7) | (32.3) |
| Operating Segments | Central and Eastern Europe | |||
| Segment Reporting Information [Line Items] | |||
| Adjusted OIBDA | (14.7) | (15.5) | (13.4) |
| Central and Corporate | |||
| Segment Reporting Information [Line Items] | |||
| Adjusted OIBDA | $ 114.3 | $ 113.9 | $ 98.5 |