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Note 12 - Notes Payable - Notes Payable (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Notes Payable [Member]    
Deferred financing costs, net $ (61.9) $ (47.7)
Balance, Net $ 4,596.1 $ 3,927.3
Notes Payable [Member] | Weighted Average [Member]    
Interest Rate [1] 3.70% 3.58%
Unsecured Debt [Member]    
Gross Balance $ 4,658.0  
Unsecured Debt [Member] | Notes Payable [Member]    
Gross Balance $ 4,650.0 $ 3,400.0
Unsecured Debt [Member] | Notes Payable [Member] | Minimum [Member]    
Interest Rate 2.70% 2.70%
Maturity Date Oct. 31, 2019  
Unsecured Debt [Member] | Notes Payable [Member] | Maximum [Member]    
Interest Rate 6.88% 6.88%
Maturity Date Sep. 30, 2047  
Line of Credit [Member] | Notes Payable [Member]    
Gross Balance [2] $ 8.0 $ 25.0
Maturity Date [2] Mar. 31, 2021  
Medium-term Notes [Member] | Notes Payable [Member]    
Gross Balance $ 300.0
Medium-term Notes [Member] | Notes Payable [Member] | Weighted Average [Member]    
Interest Rate   4.30%
Term Loan [Member]    
Maturity Date Jan. 31, 2017  
Term Loan [Member] | Notes Payable [Member]    
Gross Balance [3] $ 250.0
[1] Weighted-average interest rate
[2] During February 2017, the Company repaid the outstanding balance on the Company's $1.75 billion credit facility and terminated the agreement. Interest rate was equal to LIBOR plus 0.925% (1.67% at December 31, 2016). The Company then closed on a $2.25 billion unsecured revolving credit facility which is scheduled to mature in March 2021, with two additional six-month options to extend the maturity date, and accrues interest at a rate of LIBOR plus 0.875% (2.28% at December 31, 2017).
[3] During January 2017, the Company repaid the remaining $250.0 million balance and terminated the agreement. Interest rate was equal to LIBOR plus 0.95% (1.60% at December 31, 2016).