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Long-Term Debt (Senior Unsecured Fixed Rate Notes) (Details) - Senior Notes - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Jan. 15, 2015
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument face amount |  |  |  |  | $ 800,000,000.0
Debt instrument stated interest rate |  |  |  |  | 5.625%
Interest expense | $ 11,200,000 | $ 9,400,000 | $ 33,700,000 | $ 9,400,000 |

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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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