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Stock Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 15 Months Ended | 9 Months Ended | 3 Months Ended | 1 Months Ended | 9 Months Ended
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Jun. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2012 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Time Based Restricted Stock Unit [Member] | Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Performance Based Restricted Stock Unit [Member] | Dec. 31, 2012 Additional Restricted Stock Units [Member] | Dec. 31, 2011 Additional Restricted Stock Units [Member] | Feb. 28, 2013 Restricted Stock [Member] | Jan. 31, 2013 Restricted Stock [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2012 Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual amount of RSUs earned based on cumulative earnings |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |
Target RSUs granted range |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |
Vesting percentage per year |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Performance cycle |  |  |  |  |  |  | 3 years |  | 3 years |  |  |  |  |  |
Vesting period |  |  | 3 years | 3 years |  |  |  | 3 years |  | 3 years | 3 years |  |  | 2 years |
Shares granted during period | 58,775 | 54,825 | 35,265 | 32,894 |  |  |  |  |  | 23,510 | 21,931 |  |  |  |
Shares issued under the plan |  |  |  |  |  |  |  |  |  |  |  | 16,000 | 500 |  |
Shares issued, price per share |  |  |  |  |  |  |  |  |  |  |  | $ 58.54 | $ 42.54 |  |
Weighted average grant date fair value |  | $ 38.71 | $ 38.82 | $ 31.18 |  |  |  |  |  | $ 38.82 | $ 31.18 |  |  |  |
Compensation expense |  |  |  |  | $ 2.0 | $ 0.7 |  |  |  |  |  |  |  | $ 0.9 | $ 0.4

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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