Shareholders' Equity - Summary of Change in Components of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,702.5
Foreign currency translation adjustment	823.4	$ 224.4	$ (1,830.8)
Net change in fair value of derivatives, net of tax	(381.7)	(119.6)	605.8
Amounts reclassified to earnings of cash flow hedges, net of tax	25.4	15.7	19.8
Pension and post-retirement benefit plans, net of tax	4.0	(8.1)	(14.1)
OCI attributable to noncontrolling interests	(248.5)	(77.0)	593.4
Ending balance	2,226.4	1,702.5
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(698.3)	(733.7)	(107.8)
Ending balance	(475.7)	(698.3)	(733.7)
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	274.9	318.0	4.7
Net change in fair value of derivatives, net of tax	(381.7)	(119.6)	605.8
Amounts reclassified to earnings of cash flow hedges, net of tax	25.4	15.7	19.8
OCI attributable to noncontrolling interests	178.2	60.8	(312.3)
Ending balance	96.8	274.9	318.0
Pensions
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(16.7)	(12.3)	(4.5)
Pension and post-retirement benefit plans, net of tax	4.0	(8.1)	(14.1)
OCI attributable to noncontrolling interests	(2.6)	3.7	6.3
Ending balance	(15.3)	(16.7)	(12.3)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(956.5)	(1,039.4)	(108.0)
Foreign currency translation adjustment	823.4	224.4	(1,830.8)
OCI attributable to noncontrolling interests	(424.1)	(141.5)	899.4
Ending balance	$ (557.2)	$ (956.5)	$ (1,039.4)

Other comprehensive income change in fair value of derivatives net of tax.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

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Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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