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
Dec. 31, 2019
Investment [Line Items]          
Fair Value of Available-For-Sale Securities $ 0.8 $ 0.8 $ 0.8    
Amortized Cost 0.8 0.8 0.8   $ 0.8
Maturities of Available-For-Sale Securities   0.0 $ 35.0    
Gain (Loss) on Sale of Equity Investments $ 1.8 2.3      
Proceeds from Sale of Equity Method Investments   2.3      
Proceeds from Dividends Received   $ 0.0   $ 0.0  
Bella [Member]          
Investment [Line Items]          
Percentage of Ownership in Bella 36.00% 36.00%