| **Redeemable Noncontrolling Interests - Table 2 (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|-------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Noncontrolling Interest [Abstract]**                                              |           |            |   |   |   |   |   |   |   |   |   |
| Net income attributable to nonredeemable noncontrolling interests                   |           |            |   |   |   |   |   |   | $ 56.4 | $ 55.9 | $ 53.1 |
| Net income attributable to redeemable noncontrolling interests                      |           |            |   |   |   |   |   |   | 14.1 | 13.8 | 6.6 |
| Net income attributable to noncontrolling interests                                 | $ 16.8         | $ 16.4          | $ 18.6 | $ 18.7 | $ 18.8 | $ 17.1 | $ 17.3 | $ 16.5 | $ 70.5 | $ 69.7 | $ 59.7 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of Net Income (Loss) attributable to noncontrolling interest.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Portion of net income (loss) attributable to nonredeemable noncontrolling interest.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.
+ References
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| X                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
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