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Note 4 - Fair Value of Financial Instruments Rollforward of Level III Assets and Liabilities Fair Value Disclosure (Details) (Fair Value, Measurements, Recurring, USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Fair Value Level III Assets and Liabilities [Roll Forward]        
Fair Value, Transfers Between Level 1 And Level 2, Amount $ 0 $ 0 $ 0 $ 0
Derivative liabilities net [Member] | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Liabilities 252,100,000 426,100,000 300,900,000 254,900,000
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities 58,300,000 [1] 86,600,000 [2] 110,500,000 [3] (81,100,000) [4]
Realized and unrealized gains (losses) included in OCI 0 [5] 0 [6] 0 [6] 0 [6]
Purchases Level III Liabilities 0 0 0 0
Sales Level III Liabilities 0 0 0 0
Issuances Level III Liabilities 0 0 0 0
Settlements Level III Liabilities 0 (4,100,000) (3,400,000) (7,600,000)
Transfers Into (Out of) Level III Liabilities 0 [7] 0 [7] 0 [7] 0 [7]
Ending Balance Level III Liabilities 193,800,000 343,600,000 193,800,000 343,600,000
VIE debt | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Liabilities 95,600,000 107,400,000 94,600,000 108,900,000
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities (2,200,000) [1] (3,900,000) [2] (7,300,000) [3] (7,200,000) [4]
Realized and unrealized gains (losses) included in OCI 0 [5] 0 [6] 0 [6] 0 [6]
Purchases Level III Liabilities 0 0 0 0
Sales Level III Liabilities 0 0 0 0
Issuances Level III Liabilities 0 0 0 0
Settlements Level III Liabilities 4,200,000 4,500,000 8,300,000 9,300,000
Transfers Into (Out of) Level III Liabilities 0 [7] 0 [7] 0 [7] 0 [7]
Ending Balance Level III Liabilities 93,600,000 106,800,000 93,600,000 106,800,000
Unrealized Gains (Losses) Recorded in Earnings on Level III Liabilities Still Held (1,500,000) (2,900,000) (5,900,000) (5,400,000)
Total Level III liabilities net [Member] | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Liabilities 347,700,000 533,500,000 395,500,000 363,800,000
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities 56,100,000 [1] 82,700,000 [2] 103,200,000 [3] (88,300,000) [4]
Realized and unrealized gains (losses) included in OCI 0 [5] 0 [6] 0 [6] 0 [6]
Purchases Level III Liabilities 0 0 0 0
Sales Level III Liabilities 0 0 0 0
Issuances Level III Liabilities 0 0 0 0
Settlements Level III Liabilities 4,200,000 400,000 4,900,000 1,700,000
Transfers Into (Out of) Level III Liabilities 0 [7] 0 [7] 0 [7] 0 [7]
Ending Balance Level III Liabilities 287,400,000 450,400,000 287,400,000 450,400,000
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Unrealized Gains (Losses) Recorded in Earnings on Level III Liabilities Still Held 43,700,000 82,300,000 86,400,000 (89,700,000)
State and municipal obligations | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 19,100,000 19,200,000 18,700,000 19,000,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 400,000 [1] 200,000 [2] 800,000 [3] 400,000 [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 [5] 0 [6] 0 [6] 0 [6]
Purchases Level III Assets 0 0 0 0
Sales Level III Assets 0 0 0 0
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0 0 0 0
Transfers Into (Out of) Level III Assets 0 [7] 0 [7] 0 [7] 0 [7]
Ending Balance Level III Assets 19,500,000 19,400,000 19,500,000 19,400,000
Corporate Bond and Note Securities [Member] | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets   2,700,000   0
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings   (100,000) [2]   (100,000) [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   0 [6]   0 [6]
Purchases Level III Assets   0   2,700,000
Sales Level III Assets   0   0
Issuances Level III Assets   0   0
Settlements Level III Assets   0   0
Transfers Into (Out of) Level III Assets   (2,600,000) [7],[8]   (2,600,000) [7],[8]
Ending Balance Level III Assets   0   0
CMBS | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets   3,100,000   0
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings   0 [2]   0 [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   0 [6]   0 [6]
Purchases Level III Assets   0   3,100,000
Sales Level III Assets   3,100,000   3,100,000
Issuances Level III Assets   0   0
Settlements Level III Assets   0   0
Transfers Into (Out of) Level III Assets   0 [7]   0 [7]
Ending Balance Level III Assets   0   0
Other ABS | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 0 1,500,000 900,000 1,700,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 100,000 [1] 0 [2] 100,000 [3] 0 [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (100,000) [5] 0 [6] (100,000) [6] 0 [6]
Purchases Level III Assets 29,200,000 0 29,200,000 0
Sales Level III Assets 0 0 0 0
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0 300,000 400,000 500,000
Transfers Into (Out of) Level III Assets 45,200,000 [7],[9] 0 [7] 44,700,000 [10],[7] 0 [7]
Ending Balance Level III Assets 74,400,000 1,200,000 74,400,000 1,200,000
Equity securities | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 400,000 400,000 400,000 1,000,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings (400,000) [1] 0 [2] (400,000) [3] 0 [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 [5] 0 [6] 0 [6] 0 [6]
Purchases Level III Assets 0 0 0 0
Sales Level III Assets 0 0 0 600,000
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0 0 0 0
Transfers Into (Out of) Level III Assets 0 [7] 0 [7] 0 [7] 0 [7]
Ending Balance Level III Assets 0 400,000 0 400,000
Other investments | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 82,100,000 77,300,000 81,500,000 79,000,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 700,000 [1] (300,000) [2] 1,300,000 [3] (1,900,000) [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 [5] 0 [6] 0 [6] 0 [6]
Purchases Level III Assets 0 400,000 0 800,000
Sales Level III Assets 0 0 0 100,000
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0 0 0 400,000
Transfers Into (Out of) Level III Assets 0 [7] 0 [7] 0 [7] 0 [7]
Ending Balance Level III Assets 82,800,000 77,400,000 82,800,000 77,400,000
Investments | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 101,600,000 104,200,000 101,500,000 100,700,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 800,000 [1] (200,000) [2] 1,800,000 [3] (1,600,000) [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (100,000) [5] 0 [6] (100,000) [6] 0 [6]
Purchases Level III Assets 29,200,000 400,000 29,200,000 6,600,000
Sales Level III Assets 0 3,100,000 0 3,800,000
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0 300,000 400,000 900,000
Transfers Into (Out of) Level III Assets 45,200,000 [7] (2,600,000) [7] 44,700,000 [7] (2,600,000) [7]
Ending Balance Level III Assets 176,700,000 98,400,000 176,700,000 98,400,000
Unrealized Gains (Losses) Recorded in Earnings on Level III Assets Still Held 200,000 (400,000) 400,000 (1,900,000)
NIMS derivative assets | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets   1,600,000   1,600,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings   0 [2]   0 [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   0 [6]   0 [6]
Purchases Level III Assets   0   0
Sales Level III Assets   0   0
Issuances Level III Assets   0   0
Settlements Level III Assets   0   0
Transfers Into (Out of) Level III Assets   0 [7]   0 [7]
Ending Balance Level III Assets   1,600,000   1,600,000
Other Assets Excluding NIMS Derivative Assets [Member] | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 92,500,000 96,500,000 91,900,000 99,200,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 3,100,000 [1] 5,100,000 [2] 8,900,000 [3] 8,400,000 [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 [5] 0 [6] 0 [6] 0 [6]
Purchases Level III Assets 0 0 0 0
Sales Level III Assets 0 0 0 0
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 5,200,000 5,600,000 10,400,000 11,600,000
Transfers Into (Out of) Level III Assets 0 [7] 0 [7] 0 [7] 0 [7]
Ending Balance Level III Assets 90,400,000 96,000,000 90,400,000 96,000,000
Unrealized Gains (Losses) Recorded in Earnings on Level III Assets Still Held 1,100,000 2,600,000 4,700,000 3,400,000
Total Level III Assets | Fair Value, Inputs, Level 3
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 194,100,000 202,300,000 193,400,000 201,500,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 3,900,000 [1] 4,900,000 [2] 10,700,000 [3] 6,800,000 [4]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (100,000) [5] 0 [6] (100,000) [6] 0 [6]
Purchases Level III Assets 29,200,000 400,000 29,200,000 6,600,000
Sales Level III Assets 0 3,100,000 0 3,800,000
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 5,200,000 5,900,000 10,800,000 12,500,000
Transfers Into (Out of) Level III Assets 45,200,000 [7] (2,600,000) [7] 44,700,000 [7] (2,600,000) [7]
Ending Balance Level III Assets $ 267,100,000 $ 196,000,000 $ 267,100,000 $ 196,000,000
[1] Includes unrealized gains (losses) for the quarter ended June 30, 2014, relating to assets and liabilities still held as of June 30, 2014 as follows: $0.2 million for investments, $1.1 million for other assets, $43.7 million for derivative liabilities and $(1.5) million for VIE debt.
[2] Includes unrealized gains (losses) for the quarter ended June 30, 2013, relating to assets and liabilities still held as of June 30, 2013 as follows: $(0.4) million for investments, $2.6 million for other assets, $82.3 million for derivative liabilities and $(2.9) million for VIE debt.
[3] Includes unrealized gains (losses) for the six months ended June 30, 2014, relating to assets and liabilities still held as of June 30, 2014 as follows: $0.4 million for investments, $4.7 million for other assets, $86.4 million for derivative liabilities and $(5.9) million for VIE debt.
[4] Includes unrealized gains (losses) for the six months ended June 30, 2013, relating to assets and liabilities still held at June 30, 2013 as follows: $(1.9) million for investments, $3.4 million for other assets, $(89.7) million for derivative liabilities and $(5.4) million for VIE debt.
[5] Realized and unrealized gains (losses) included in Other Comprehensive Income (“OCI”).
[6] Realized and unrealized gains (losses) included in OCI.
[7] Transfers are recognized at the end of the period as the availability of market observed inputs change from period to period.
[8] During the period, pricing from a third-party pricing source became available that utilized observable inputs for individual instruments. As a result, these instruments were transferred out of Level III and into Level II.
[9] During the period, certain securities previously classified in Level II were transferred to Level III as the pricing inputs were no longer considered observable.
[10] During the period, certain securities previously classified in Level II were transferred to Level III as the pricing inputs were no longer considered observable. Other securities were transferred out of Level III as third-party pricing became available.