Long-lived Assets (Schedule of expected future amortization expense for finite lived intangible assets) (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Long-lived Assets [Abstract] | ||
| 2020 | $ 178.5 | |
| 2021 | 88.9 | |
| 2022 | 38.3 | |
| 2023 | 32.6 | |
| 2024 | 32.4 | |
| Thereafter | 201.4 | |
| Net carrying amount | $ 572.1 | $ 1,031.2 |