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Interim Financial Statements - Fair Value, Assets Held For Sale, Discontinued Operations (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) item | Dec. 31, 2018 USD ($)
Fair Value of Financial Instruments |  |
Debt instrument, Carrying Value | $ 2,227.5 | $ 2,216.7
Assets Held for Sale and Discontinued Operations |  |
Number of entities newly classified as held for sale | item | 0 |
3.75% senior subordinated notes due 2020 |  |
Fair Value of Financial Instruments |  |
Interest rate (as a percent) | 3.75% | 3.75%
Debt instrument, Carrying Value | $ 298.5 | $ 297.9
3.75% senior subordinated notes due 2020 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | $ 299.8 | $ 291.9
5.75% senior subordinated notes due 2022 |  |
Fair Value of Financial Instruments |  |
Interest rate (as a percent) | 5.75% | 5.75%
Debt instrument, Carrying Value | $ 547.2 | $ 546.8
5.75% senior subordinated notes due 2022 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | $ 556.8 | $ 537.6
5.375% senior subordinated notes due 2024 |  |
Fair Value of Financial Instruments |  |
Interest rate (as a percent) | 5.375% | 5.375%
Debt instrument, Carrying Value | $ 297.8 | $ 297.6
5.375% senior subordinated notes due 2024 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | $ 304.5 | $ 278.7
5.50% senior subordinated notes due 2026 |  |
Fair Value of Financial Instruments |  |
Interest rate (as a percent) | 5.50% | 5.50%
Debt instrument, Carrying Value | $ 495.4 | $ 495.1
5.50% senior subordinated notes due 2026 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | 514.9 | 465.2
Mortgage facilities |  |
Fair Value of Financial Instruments |  |
Debt instrument, Carrying Value | 402.1 | 289.6
Mortgage facilities | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | $ 408.1 | $ 290.2
Retail Automotive Franchise | Disposal group, not discontinued operations |  |
Disposals |  |
Number of franchises disposed | item | 12 |
Retail Commercial Truck Location | Disposal group, not discontinued operations |  |
Disposals |  |
Number of locations disposed | item | 1 |

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