Redeemable Non-Controlling Interests (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Redeemable Noncontrolling Interest [Roll Forward]
Balance, as of December 31, 2017	$ 811.9
Changes attributable to consolidated products	2.8
Transfers to Other liabilities	(45.9)
Transfers from Non-controlling interests	23.4	$ 47.2
Changes in redemption value	161.3
Balance, as of June 30, 2018	$ 953.5
Minimum
Noncontrolling Interest [Line Items]
Term of conditional right to put interest	5 years
Maximum
Noncontrolling Interest [Line Items]
Term of conditional right to put interest	15 years