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Operating Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2013 $ 18.3    
2014 18.3    
2015 17.6    
2016 13.1    
2017 10.6    
Thereafter 28.3    
Total future minimum lease payments 106.2    
Operating Leases, Rent Expense, Net [Abstract]      
Operating Leases, Rent Expense $ 22.4 $ 21.6 $ 23.9