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Financial Instruments and Derivative Financial Instruments Financial Instruments and Derivative Financial Instruments - Interest Rate Derivatives (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ (0.1)  
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 56.5 $ 0.0
Derivative, Average Fixed Interest Rate 1.94% 0.00%
Term of Interest Rate Cash Flow Hedge November 2017 to November 2022  
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 83.5 $ 0.0
Derivative, Average Fixed Interest Rate 2.20% 0.00%
Term of Interest Rate Cash Flow Hedge December 2018 to May 2023  
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 100.0 $ 100.0
Derivative, Average Fixed Interest Rate 1.47% 1.47%
Term of Interest Rate Cash Flow Hedge Extending to December 2018  
Cash Flow Hedging [Member] | Interest Rate Contract [Member]    
Derivative [Line Items]    
Interest Rate Derivatives, at Fair Value, Net $ (0.8) $ (0.3)