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Redeemable Noncontrolling Interests - Redeemable Noncontrolling Interests Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]
Balance at beginning of period			$ 239.6
Net income attributable to noncontrolling interests	$ 2.2	$ 3.7	5.7	$ 10.1
Distributions declared	(21.8)	(20.2)	(50.9)	(52.8)
Change in fair value		(18.2)		(118.9)
Balance at end of period	34.0		34.0
Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]
Balance at beginning of period			239.6	261.7
Net income attributable to noncontrolling interests			5.7	10.1
Distributions declared			(5.8)	(7.6)
Contribution to joint venture			3.1	1.0
Reclassification to noncontrolling interests			0.0	(11.2)
Purchase of redeemable noncontrolling interests			(162.3)	(162.9)
Exchange transaction			(46.3)	0.0
Change in fair value			0.0	118.9
Balance at end of period	$ 34.0	$ 210.0	$ 34.0	$ 210.0

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Contribution of primarily intangible assets relating to a joint venture agreement.

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Noncontrolling Interest, Exchange Transaction

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

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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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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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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