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Incentive Award Plan and Employee Stock Purchase Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended |  |  |  |  |  |  |  |
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May 15, 2013 | Mar. 04, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 2010 Employee Stock Purchase Plan (ESPP) | Mar. 30, 2013 2010 Employee Stock Purchase Plan (ESPP) | May 15, 2013 Performance Based Award installment | May 15, 2013 Restricted Stock Units (RSUs) installment | Mar. 04, 2013 Chief Executive Officer | Mar. 04, 2013 Chief Executive Officer Performance Based Award installment | Jun. 30, 2013 Other Executive Officers | Mar. 04, 2013 Other Executive Officers | Jun. 30, 2013 Other Executive Officers Performance Shares 2012 [Member] | Mar. 04, 2013 Other Executive Officers Performance Based Award | Jun. 30, 2013 Other Executive Officers Restricted Stock Units (RSUs) installment | Mar. 04, 2013 Other Executive Officers Restricted Stock Units (RSUs) installment | Jun. 30, 2013 Other Executive Officers Performance Shares 2013 [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based awards, grant date fair market value | $ 2.6 | $ 3.2 |  |  |  |  |  |  |  |  | $ 1.0 | $ 0.5 | $ 0.9 | $ 2.0 | $ 0.3 | $ 1.0 | $ 0.5 | $ 1.0 | $ 0.1
Share-based awards, grants in period | 99,900 | 143,182 |  |  |  |  |  |  | 59,942 | 39,958 |  |  |  |  |  |  |  |  |
Share-based awards, number of equal vesting components |  |  |  |  |  |  |  |  | 12 | 8 |  | 3 |  |  |  |  | 3 | 3 |
Employee stock purchase plan shares issued during period |  |  |  |  |  |  | 98,872 | 104,328 |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 4.2 | $ 3.1 | $ 10.2 | $ 6.5 |  |  |  |  |  |  |  |  |  |  |  |  |

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