Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 314.2	$ 243.5	$ 593.0	$ 410.1
Foreign currency translation adjustment	(256.8)	355.4	(472.4)	461.2
Net change in fair value of net investment hedges, net of tax of $(29.3), $(48.8), $(37.9) and $(38.1)	113.5	(172.9)	116.0	(216.4)
Net change in fair value of cash flow hedges, net of tax of $0.3, $5.9, $(10.1) and $6.8	(0.7)	(16.5)	27.6	(19.1)
Amounts reclassified to earnings of cash flow hedges, net of tax of $(1.5), $(2.5), $(2.3) and $(3.8)	3.9	7.3	6.2	11.0
Gain (loss) recognized on defined benefit pension plans, net of tax of $0.0, $1.1, $0.0 and $1.4	0.0	0.6	0.2	0.3
Other comprehensive income (loss)	(140.1)	173.9	(322.4)	237.0
Comprehensive income (loss)	174.1	417.4	270.6	647.1
Comprehensive income (loss) attributable to noncontrolling interests	0.2	0.4	0.4	0.8
Comprehensive income attributable to preferred unitholder	0.0	67.5	0.0	135.0
Comprehensive income (loss) attributable to common unitholders	$ 173.9	$ 349.5	$ 270.2	$ 511.3