Annual report pursuant to Section 13 and 15(d)

Investments (Details)

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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment [Line Items]        
Fair Value of Available-For-Sale Securities $ 0.8 $ 0.8 $ 0.8  
Amortized Cost 0.8 0.8 0.8  
Maturities of Available-For-Sale Securities   0.0 35.0 $ 10.7
Gain (Loss) on Sale of Equity Investments $ 2.3 2.3    
Proceeds from Sale of Equity Method Investments   2.3    
Proceeds from Dividends Received   $ 0.0 $ 0.4 $ 0.0
Bella [Member]        
Investment [Line Items]        
Percentage of Ownership in Bella 36.00% 36.00%