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Investments (Narrative) (Details)
£ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
GBP (£)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Schedule of Investments [Line Items]              
Money Market Investments   $ 111.8       $ 217.6  
Payments to Acquire Marketable Securities   $ 0.0   $ 0.0      
Document Fiscal Year Focus   2018 2018        
Marketable Securities, cumulative realized gain on sale   $ 28.5          
Equity Securities, Realized loss on sale   (2.6)          
Proceeds from sales of marketable equity securities   50.5          
Proceeds from sales of marketable equity securities       0.0      
Equity Securities sill held, unrealized loss   (11.5)          
Equity Securities without Readily Determinable Fair Value   19.9       $ 19.9  
Graham Healthcare Group [Member]              
Schedule of Investments [Line Items]              
Revenue from Related Parties   $ 3.7   $ 4.6      
Subsequent Event [Member]              
Schedule of Investments [Line Items]              
Proceeds from Q1 sales of marketable securities settled in April 2018 $ 0.9            
Intersection Holdings [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Percentage Acquired   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%    
Residential Hospice Illinois [Member] | Graham Healthcare Group [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage   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%    
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%    
York Joint Venture [Member] | KIHL [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage   45.00%     45.00%    
Loan commitment to affiliate | £         £ 25.0    
Advances to Affiliate | £             £ 16.0
Payments to Fund Long-term Loans to Related Parties | £     £ 0.0        
Loan Receivable, Payment Terms   25 years 25 years        
Loan Receivable Fixed Interest Rate   7.00% 7.00%