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Income Taxes (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Unrecognized tax benefit      
Beginning balance $ 29.7 $ 38.7 $ 40.1
Increases in tax positions for prior years 1.4 0.8 1.6
Decreases in tax positions for prior years (1.0) (7.5) (1.8)
Acquisition related:      
Purchase Accounting     3.2
Decrease for prior years     (2.2)
Increases in tax positions for current year 1.9 1.1 1.9
Settlements (0.4) (0.1)  
Lapse in statutes of limitation (1.2) (3.3) (4.1)
Ending balance $ 30.4 $ 29.7 $ 38.7