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Consolidated Statements of Stockholders' Equity (USD $)
In Millions
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Total
Balance at Dec. 31, 2009 $ 0.4 $ 11.7 $ (5.2) $ 185.0 $ 31.2 $ 223.1
Comprehensive income       150.6 14.8 165.4
Dividends on common stock       (52.0)   (52.0)
Shares issued for restricted stock units   (0.1) 0.1     0
Income tax benefits from equity awards   2.8       2.8
Stock options exercised   3.0 0.2     3.2
Stock-based compensation   5.3       5.3
Balance at Dec. 31, 2010 0.4 22.7 (4.9) 283.6 46.0 347.8
Comprehensive income       149.0 (5.2) 143.8
Dividends on common stock       (60.1)   (60.1)
Shares issued for restricted stock units   (0.1) 0.1     0
Income tax benefits from equity awards   3.5       3.5
Stock options exercised   4.8 0.3     5.1
Stock-based compensation   6.5       6.5
Balance at Dec. 31, 2011 0.4 37.4 (4.5) 372.5 40.8 446.6
Comprehensive income       88.9 16.8 105.7
Dividends on common stock       (66.4)   (66.4)
Shares issued for restricted stock units   (0.1) 0.1     0
Income tax benefits from equity awards   1.7       1.7
Stock options exercised   7.0 0.4     7.4
Stock-based compensation   8.5       8.5
Balance at Dec. 31, 2012 $ 0.4 $ 54.5 $ (4.0) $ 395.0 $ 57.6 $ 503.5