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Financial Commitments (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011
Swap [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum adjustment to Applicable Rate (in hundredths) | 0.975% |  |
Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Term loan amount | $ 200 |  |
Term loan amount outstanding | 170 |  |
Revolving Credit Facility [Member] |  |  |
Amended Credit Agreement [Abstract] |  |  |
Original sublimit for letters of credit | 50 |  |
Amended sublimit for letters of credit | 150 |  |
Percentage of consolidated net worth that is factored into consolidated net worth covenant (in hundredths) |  | 85.00% |
Maximum goodwill and intangible assets impairment charge added back to covenants | 450 |  |
Minimum fixed charge ratio, quarter ending September 30, 2012 (in hundredths) | 1.0 |  |
Minimum fixed charge ratio, quarter ending December 30, 2012 (in hundredths) | 1.0 |  |
Minimum fixed charge ratio, quarter ending March 31, 2013 (in hundredths) | 1.10 |  |
Minimum fixed charge ratio, quarter ending June 30, 2013 (in hundredths) | 1.10 |  |
Minimum fixed charge ratio, quarter ending September 30, 2013 and thereafter (in hundredths) | 1.25 |  |
Maximum consolidated leverage ratio, quarter ending September 30, 2012 (in hundredths) | 4.25 |  |
Maximum consolidated leverage ratio, quarter ending December 31, 2012 (in hundredths) | 4.25 |  |
Maximum consolidated leverage ratio, quarter ending March 31, 2013 (in hundredths) | 4.25 |  |
Maximum consolidated leverage ratio, quarter ending June 30, 2013 (in hundredths) | 3.75 |  |
Maximum consolidated leverage ratio, quarter ending September 30, 2013 (in hundredths) | 3.75 |  |
Maximum consolidated leverage ratio, quarter ending December 31, 2013 (in hundredths) | 3.75 |  |
Maximum consolidated leverage ratio, quarter ending March 31, 2014 (in hundredths) | 3.25 |  |
Maximum consolidated leverage ratio, quarter ending June 30, 2014 (in hundredths) | 3.25 |  |
Maximum consolidated leverage ratio, quarter ending September 30, 2014 (in hundredths) | 3.25 |  |
Maximum consolidated leverage ratio, quarter ending December 31, 2014 and thereafter (in hundredths) | 2.75 |  |
Minimum adjustment to British Bankers Association LIBOR rate (in hundredths) | 2.00% |  |
Maximum adjustment to British Bankers Association LIBOR rate (in hundredths) | 4.00% |  |
Maximum adjustment to Federal Funds rate (in hundredths) | 0.50% |  |
Maximum adjustment to Bank of America, N.A. prime rate (in hundredths) | 3.00% |  |
Minimum commitment fee percentage (in hundredths) | 0.375% |  |
Maximum commitment fee percentage (in hundredths) | 0.70% |  |
Maximum borrowing capacity | 300 |  |
Additional increase in base facility | 50 |  |
Outstanding borrowings | 42.5 |  | 0
Letters of credit outstanding | 0.2 |  | 3.0
Available borrowing capacity | $ 257.3 |  |

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