Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Gross carrying amount | $ 4,530.2 | $ 4,572.9 |
| Accumulated amortization | (3,199.7) | (2,964.4) |
| Net carrying amount | 1,330.5 | 1,608.5 |
| Customer relationships | ||
| Property, Plant and Equipment [Line Items] | ||
| Gross carrying amount | 4,013.3 | 4,041.0 |
| Accumulated amortization | (2,958.7) | (2,745.8) |
| Net carrying amount | 1,054.6 | 1,295.2 |
| Other | ||
| Property, Plant and Equipment [Line Items] | ||
| Gross carrying amount | 516.9 | 531.9 |
| Accumulated amortization | (241.0) | (218.6) |
| Net carrying amount | $ 275.9 | $ 313.3 |