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Long-Term Debt Long-term Debt Maturity Schedule (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 55.5  
Long-term Debt, Maturities, Repayments of Principal in Year Two 2.4  
Long-term Debt, Maturities, Repayments of Principal in Year Three 4.2  
Long-term Debt, Maturities, Repayments of Principal in Year Four 0.4  
Long-term Debt, Maturities, Repayments of Principal in Year Five 638.0  
Long-term Debt, Maturities, Repayments of Principal after Year Five 753.6  
Long-term Debt $ 1,454.1 $ 1,180.2