| **Income Taxes - Deferred Tax Asset and Liabilities (Details) - USD ($) $ in Millions** | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 |
|-----------------------------------------------------------------------------------------|---------------|---------------|---------------|
| **Deferred income tax assets:**                                                         |          |          |          |
| Net operating loss                                                                      | $ 64.8        |          | $ 161.1       |
| Property, net                                                                           | 52.1          |          | 48.2          |
| Insurance reserve                                                                       | 32.0          |          | 26.0          |
| Stock-based compensation                                                                | 23.7          |          | 23.4          |
| Allowance for doubtful accounts                                                         | 19.3          | $ 7.0         | 24.5          |
| Alternative minimum tax                                                                 | 7.5           |          | 10.6          |
| Carrying value of partnerships                                                          | 12.9          |          | 22.1          |
| Other accruals                                                                          | 26.1          |          | 25.7          |
| Tax credits                                                                             | 2.6           |          | 14.0          |
| Noncontrolling interest                                                                 | 14.8          |          | 10.6          |
| Other                                                                                   | 0.8           |          | 0.8           |
| Total deferred income tax assets                                                        | 256.6         |          | 367.0         |
| Less: Valuation allowance                                                               | (27.9)        |          | (27.6)        |
| Net deferred income tax assets                                                          | 228.7         |          | 339.4         |
| **Deferred income tax liabilities:**                                                    |          |          |          |
| Intangibles                                                                             | (113.2)       |          | (112.8)       |
| Convertible debt interest                                                               | (38.1)        |          | (35.3)        |
| Other                                                                                   | (1.6)         |          | (0.5)         |
| Total deferred income tax liabilities                                                   | (152.9)       |          | (148.6)       |
| Net deferred income tax assets                                                          | $ 75.8        |          | $ 190.8       |

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from equity method investments.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.
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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated losses under self insurance.
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.
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