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Net Income Per Common Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net Income Per Common Share                      
Net income                 $ 187.9 $ 164.3 $ 135.5
Basic net income per common share:                      
Weighted average common shares outstanding (in shares)                 100.0 100.2 98.8
Basic net income per common share (in dollars per share) $ 0.47 $ 0.49 $ 0.49 $ 0.43 $ 0.37 $ 0.40 $ 0.48 $ 0.40 $ 1.88 $ 1.64 $ 1.37
Diluted net income per common share:                      
Weighted average common shares outstanding - Basic (in shares)                 100.0 100.2 98.8
Plus incremental shares from assumed conversions:                      
Restricted stock units (in shares)                 0.7 0.8 0.9
Stock options (in shares)                 1.4 1.0 1.0
Weighted average common shares outstanding - Dilutive (in shares)                 102.1 102.0 100.7
Diluted net income per common share (in dollars per share) $ 0.46 $ 0.48 $ 0.48 $ 0.43 $ 0.36 $ 0.39 $ 0.47 $ 0.39 $ 1.84 $ 1.61 $ 1.35
Anti-dilutive securities excluded from computation of earnings per share amount (in shares)                   0.5 0.3