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Refundable Income Taxes and Income Taxes Payable (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Refundable income taxes and income taxes payable [Line Items]    
Refundable income taxes   $ 30.0
Prepaid Expenses and Other Current Assets [Member]    
Refundable income taxes and income taxes payable [Line Items]    
Refundable income taxes $ 9.8 9.6
Other Assets and Deferred Charges [Domain]    
Refundable income taxes and income taxes payable [Line Items]    
Refundable income taxes   20.4
Accrued Liabilities [Member]    
Refundable income taxes and income taxes payable [Line Items]    
Taxes Payable, Current $ 10.0 $ 11.6