Derivative Instruments - Quantitative Disclosures of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI into Earnings	$ (31.0)	$ (21.3)	$ (53.6)
Gain (loss) recognized in other operating expenses (income), net	0.0	0.0	(37.3)
Forward-starting interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in other operating expenses (income), net	0.0	0.0	(1.6)
Derivatives not designated as hedging instruments: \| Forward-starting interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in other operating expenses (income), net	0.0	0.0	(12.4)
Derivatives not designated as hedging instruments: \| Forward-currency contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in other operating expenses (income), net	0.0	0.0	4.3
Derivatives designated as cash flow hedges: \| Forward-starting interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in other comprehensive income (loss)	(5.5)	(22.7)	(128.2)
Derivatives designated as cash flow hedges: \| Forward-starting interest rate swaps \| Gain (Loss) Reclassified from AOCI into Earnings (Effective Portion) \| Other operating expenses (income), net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI into Earnings	0.0	0.0	(27.6)
Derivatives designated as cash flow hedges: \| Forward-currency contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in other comprehensive income (loss)	(9.4)	(4.8)	18.2
Derivatives designated as cash flow hedges: \| Interest expense, net \| Gain (Loss) Reclassified from AOCI into Earnings (Effective Portion) \| Interest expense, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI into Earnings	(31.0)	(21.3)	(12.0)
Derivatives designated as cash flow hedges: \| Cost of sales \| Gain (Loss) Reclassified from AOCI into Earnings (Effective Portion) \| Cost of sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI into Earnings	(3.4)	0.0	12.3
Derivatives designated as net investment hedges: \| Cross-currency rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in other comprehensive income (loss)	$ (383.5)	$ (87.0)	$ 798.5

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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