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Short-Term Credit Facility (Details) In Millions, unless otherwise specified	9 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2014 ZAR	Mar. 31, 2014 South African Credit Facility [Member] USD ($)	Mar. 31, 2014 South African Credit Facility [Member] ZAR	Jun. 30, 2013 South African Credit Facility [Member] ZAR	Mar. 31, 2014 Bank Overdrafts Facility [Member] ZAR	Nov. 30, 2013 Bank Overdrafts Facility [Member] ZAR	Mar. 31, 2014 Derivative Facilities [Member] ZAR	Mar. 31, 2014 Standby Letter of Credit [Member] USD ($)	Mar. 31, 2014 Standby Letter of Credit [Member] ZAR	Mar. 31, 2014 Korea, Hana Bank Overdraft Facility [Member] USD ($)	Mar. 31, 2014 Korea, Hana Bank Overdraft Facility [Member] KRW
Short-term Debt [Line Items]
Maximum borrowing capacity						500.0	250.0	150.0			$ 9.3	10,000.0
Short-term credit facility utilized	$ 13.5	143.1	$ 23.6	250.0	0				$ 13.5	143.1
Overdraft rate			7.85%	7.85%							4.98%	4.98%
Commitment fee percentage	0.35%	0.35%

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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