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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Redeemable Noncontrolling Interest [Line Items]
Balance at beginning of period			$ 261.7
Net income attributable to noncontrolling interests	$ 2.4	$ 3.7	6.4	$ 6.5
Distributions declared	(17.3)	(19.1)	(32.6)	(36.8)
Reclassification to noncontrolling interests			11.2	0.0
Change in fair value	(80.4)	(24.1)	(100.7)	(66.3)
Balance at end of period	352.8		352.8
Redeemable Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]
Balance at beginning of period			261.7	220.9
Net income attributable to noncontrolling interests			6.4	6.5
Distributions declared			(4.8)	(4.6)
Purchase of redeemable noncontrolling interests			0.0	(65.1)
Change in fair value			100.7	66.2
Balance at end of period	$ 352.8	$ 223.9	$ 352.8	$ 223.9

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Amount of redeemable noncontrolling interests reclassified to noncontrolling interests during the period.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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