Derivatives and Hedging Activities - Summary of the (losses) gains related to cash flow hedges (Details) - Cash flow hedges - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
(Losses) gains related to cash flow hedges
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 6.2	$ (5.9)	$ 35.8	$ (20.6)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	2.1	(2.8)	(1.0)	(20.0)
Amount of Gain Reclassified from AOCI into Income (Ineffective Portion)	0.0	1.4	(0.8)	2.0
Commodity contracts
(Losses) gains related to cash flow hedges
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	6.8	(5.7)	37.1	(21.1)
Commodity contracts \| Cost of sales
(Losses) gains related to cash flow hedges
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	2.5	(3.1)	(0.3)	(21.0)
Amount of Gain Reclassified from AOCI into Income (Ineffective Portion)	0.0	1.4	(0.8)	2.0
Foreign exchange contracts
(Losses) gains related to cash flow hedges
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(0.6)	(0.2)	(1.3)	0.5
Foreign exchange contracts \| Net sales
(Losses) gains related to cash flow hedges
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(0.5)	0.2	(1.0)	0.7
Amount of Gain Reclassified from AOCI into Income (Ineffective Portion)	0.0	0.0	0.0	0.0
Forward interest rate swaps \| Interest expense
(Losses) gains related to cash flow hedges
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	0.1	0.1	0.3	0.3
Amount of Gain Reclassified from AOCI into Income (Ineffective Portion)	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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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=84234895&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=84234895&loc=SL5624177-113959

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

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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