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Fair Value Measurements Fair Value and Related Carrying Amount of Certain Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents, at Carrying Value $ 92.4 $ 0.0 $ 0.0
Checks outstanding in excess of cash balances 0.7 14.6  
Debt, Long-term and Short-term, Combined Amount 2,081.1 2,507.1  
Long-term debt 2,029.4 2,507.1  
Estimate of Fair Value Measurement [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents, at Carrying Value 92.4 0.0  
Checks outstanding in excess of cash balances 0.7 14.6  
Long-term debt, fair value $ 1,959.1 $ 2,350.5