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Interim Financial Statements - Assets Held For Sale, Discontinued Operations, Fair Value and Income Taxes (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($)
Combined financial information regarding entities accounted for as discontinued operations |  |
Number of entities newly classified as held for sale | item | 0 |
Fair Value of Financial Instruments |  |
Debt instrument, Carrying Value | $ 2,151.9 | $ 2,163.2
Income Taxes |  |
Corporate tax rate (as a percent) | 21.00% | 35.00%
Adjustment to the provisional estimate relating to the Tax Cuts and Jobs Act of 2017 | $ 0.0 |
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 | $ 546.4 | $ 545.9
5.75% senior subordinated notes due 2022 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | $ 559.6 | $ 562.3
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 | $ 297.4 | $ 297.2
5.375% senior subordinated notes due 2024 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | $ 292.8 | $ 300.2
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 | $ 494.7 | $ 494.4
5.50% senior subordinated notes due 2026 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | $ 484.9 | $ 505.0
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 | $ 297.2 | $ 296.5
3.75% senior subordinated notes due 2020 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | 294.0 | 301.7
Mortgage facilities |  |
Fair Value of Financial Instruments |  |
Debt instrument, Carrying Value | 245.8 | 235.5
Mortgage facilities | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Fair Value | $ 243.2 | $ 233.4
Retail Automotive Franchise |  |
Divestitures |  |
Number of franchises disposed | item | 6 |

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