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Debt - Schedule of long-term debt outstanding (Details) - USD ($) | Mar. 31, 2016 | Jun. 30, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Total | $ 612,900,000 | $ 607,100,000
Less: amounts due within one year | 0 | 0
Long-term debt, net of current portion | 612,900,000 | 607,100,000
Medium-term notes, Series B 6.97% to 7.10% due April 2018 To May 2018 |  |
Debt Instrument [Line Items] |  |
Face amount | 55,000,000.0 | 55,000,000.0
Total | $ 55,000,000 | $ 55,000,000
Medium-term notes, Series B 6.97% to 7.10% due April 2018 To May 2018 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 6.97% | 6.97%
Medium-term notes, Series B 6.97% to 7.10% due April 2018 To May 2018 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 7.10% | 7.10%
Senior unsecured notes, 5.20% due July 2021 |  |
Debt Instrument [Line Items] |  |
Face amount | $ 250,000,000.0 | $ 250,000,000.0
Interest rate (as a percent) | 5.20% | 5.20%
Total | $ 258,200,000 | $ 252,500,000
4.45% Senior Unsecured Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Face amount | $ 300,000,000.0 | $ 300,000,000.0
Interest rate (as a percent) | 4.45% | 4.45%
Total | $ 299,700,000 | $ 299,600,000

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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