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Investments (Narrative) (Details)
£ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Schedule of Investments [Line Items]                
Money Market Investments $ 157.2     $ 157.2     $ 217.6  
Payments to Acquire Marketable Securities       0.0 $ 0.0      
Cumulative Realized Gain (Loss) on Marketable securities       37.3        
Proceeds from sales of marketable equity securities       66.7 0.0      
Equity Securities without Readily Determinable Fair Value 19.9     19.9     $ 19.9  
Graham Healthcare Group [Member]                
Schedule of Investments [Line Items]                
Revenue from Related Parties $ 3.3   $ 5.0 $ 7.0 $ 9.6      
Intersection Holdings [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage 11.00%     11.00%   11.00%    
Residential Home Health Illinois [Member] | Graham Healthcare Group [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage 40.00%     40.00%   40.00%    
Residential Hospice Illinois [Member] | Graham Healthcare Group [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage 42.50%     42.50%   42.50%    
Residential Healthcare Michigan hospital joint venture [Member] | Graham Healthcare Group [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage 40.00%     40.00%   40.00%    
Celtic Healthcare Allegheny Health Network Joint Venture [Member] | Graham Healthcare Group [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage 40.00%     40.00%   40.00%    
York Joint Venture [Member] | KIHL [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage 45.00%     45.00%   45.00%    
Loan commitment to affiliate | £           £ 25    
Advances to Affiliate | £           £ 22   £ 16
Payments to Fund Long-term Loans to Related Parties | £   £ 6            
Loan Receivable, Payment Terms 25 years 25 years            
Loan Receivable Fixed Interest Rate 7.00% 7.00%