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Quarterly Information (Unaudited) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
QUARTERLY INFORMATION |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,583,536,000 | $ 1,573,295,000 | $ 1,563,860,000 | $ 1,536,276,000 | $ 1,541,094,000 | $ 1,570,720,000 | $ 1,513,344,000 | $ 1,425,376,000 | $ 6,256,967,000 | $ 6,050,534,000 | $ 5,136,435,000
Earnings from Continuing operations | 54,945,000 | 64,311,000 | 46,767,000 | 34,876,000 | 47,664,000 | 56,933,000 | 40,914,000 | 25,857,000 | 200,899,000 | 171,368,000 | 124,608,000
Net earnings | 53,844,000 | 75,091,000 | 46,723,000 | 34,321,000 | 48,095,000 | 56,524,000 | 40,033,000 | 25,125,000 | 209,979,000 | 169,777,000 | 118,170,000
Earnings from Continuing operations per Common Share |  |  |  |  |  |  |  |  |  |  |
Continuing operations (USD per share) | $ 1.07 | $ 1.26 | $ 0.92 | $ 0.68 | $ 0.93 | $ 1.11 | $ 0.80 | $ 0.50 | $ 3.93 | $ 3.34 | $ 2.38
Continuing operations (USD per share) | $ 1.07 | $ 1.26 | $ 0.91 | $ 0.68 | $ 0.92 | $ 1.10 | $ 0.79 | $ 0.50 | $ 3.91 | $ 3.31 | $ 2.37
Net earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (USD per share) | $ 1.05 | $ 1.47 | $ 0.92 | $ 0.67 | $ 0.94 | $ 1.10 | $ 0.78 | $ 0.49 | $ 4.11 | $ 3.31 | $ 2.25
Diluted (USD per share) | $ 1.05 | $ 1.47 | $ 0.91 | $ 0.67 | $ 0.93 | $ 1.10 | $ 0.77 | $ 0.48 | $ 4.09 | $ 3.28 | $ 2.25
Quarterly Information (Unaudited) (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit per diluted common share |  |  |  |  |  |  |  |  | $ 0.10 | $ 0.01 |
Income tax benefit |  |  |  |  |  |  |  |  |  | 1,000,000 |
Tax benefit from favorable resolution of a tax item |  |  |  |  |  |  |  |  | 5,000,000 |  |
State Of Michigan [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Information (Unaudited) (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit per diluted common share |  |  |  |  |  |  |  |  |  | $ 0.10 |
Changes In Tax Law Impact On Net Earnings |  |  |  |  |  |  |  |  |  | (5,350,000) |
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Information (Unaudited) (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit per diluted common share |  |  |  |  |  |  |  |  | $ 0.02 |  |
Changes In Tax Law Impact On Net Earnings |  |  |  |  |  |  |  |  | $ (856,000) |  | $ 400,000

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