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Redeemable Noncontrolling Interests - Table 2 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Noncontrolling Interest [Abstract]
Net income attributable to nonredeemable noncontrolling interests	$ 17.7	$ 13.8	$ 36.3	$ 28.3
Net income attributable to redeemable noncontrolling interests	3.7	2.6	6.5	5.7
Net income attributable to noncontrolling interests	$ 21.4	$ 16.4	$ 42.8	$ 34.0

X

- Definition

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

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Portion of net income (loss) attributable to nonredeemable noncontrolling interest.

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

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