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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Redeemable Noncontrolling Interest [Line Items]
Balance at beginning of period	$ 220.9
Net income attributable to noncontrolling interests	13.9	$ 17.9	$ 14.1
Distributions declared	(71.1)	(50.5)	(54.2)
Change in fair value	(91.0)	(67.0)	(10.9)
Balance at end of period	261.7	220.9
Redeemable Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]
Balance at beginning of period	220.9	138.3	121.1
Net income attributable to noncontrolling interests	13.9	17.9	14.1
Distributions declared	(8.6)	(4.6)	(7.8)
Contribution to joint venture	9.6	2.3	0.0
Purchase of redeemable noncontrolling interests	(65.1)	0.0	0.0
Change in fair value	91.0	67.0	10.9
Balance at end of period	$ 261.7	$ 220.9	$ 138.3

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

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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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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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