| **Redeemable Noncontrolling Interests - Table 2 (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended                                                  | 12 Months Ended                                                 |
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| **Redeemable Noncontrolling Interest [Line Items]**                                                        |                                                            |                                                            |   |   |   |   |   |   |   |   |   |
| Net income attributable to nonredeemable noncontrolling interest                                           |                                                            |                                                            |   |   |   |   |   |   | $ 53.1us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest | $ 52.0us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest | $ 47.1us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest |
| Net income attributable to redeemable noncontrolling interest                                              |                                                            |                                                            |   |   |   |   |   |   | 6.6us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | 5.8us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | 3.8us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest |
| Net income attributable to noncontrolling interests                                                        | $ 15.4us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 14.7us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 14.8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 14.8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 15.3us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 14.1us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 13.8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 14.6us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 59.7us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 57.8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 50.9us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of Net Income (Loss) attributable to noncontrolling interest.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Portion of net income (loss) attributable to nonredeemable noncontrolling interest.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688
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| X                                                                                                                                                                             |
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