Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Gross carrying amount | $ 4,217.6 | $ 4,194.4 |
| Accumulated amortization | (3,645.5) | (3,163.2) |
| Net carrying amount | 572.1 | 1,031.2 |
| Customer relationships | ||
| Gross carrying amount | 3,653.9 | 3,673.1 |
| Accumulated amortization | (3,363.6) | (2,914.2) |
| Net carrying amount | 290.3 | 758.9 |
| Other | ||
| Gross carrying amount | 563.7 | 521.3 |
| Accumulated amortization | (281.9) | (249.0) |
| Net carrying amount | $ 281.8 | $ 272.3 |
| Minimum | Customer relationships | ||
| Estimated useful life at December 31, 2019 | 5 years | |
| Minimum | Other | ||
| Estimated useful life at December 31, 2019 | 2 years | |
| Maximum | Customer relationships | ||
| Estimated useful life at December 31, 2019 | 10 years | |
| Maximum | Other | ||
| Estimated useful life at December 31, 2019 | 15 years |