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Commitments and Contingencies - Legal Narrative (Details) € in Millions, £ in Millions, NZD in Millions |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jun. 29, 2015 NZD | Jan. 26, 2015 USD ($) | Jan. 26, 2015 CHF (SFr) | Dec. 02, 2014 USD ($) | Dec. 02, 2014 CHF (SFr) | Jan. 02, 2014 GBP (£) | Jun. 01, 2007 USD ($) | Jun. 01, 2007 CHF (SFr) | Aug. 31, 2015 USD ($) | Jun. 30, 2015 GBP (£) | Mar. 31, 2015 USD ($) | May. 31, 2010 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2015 EUR (€) | Dec. 31, 2015 USD ($) | Apr. 30, 2014 GBP (£)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of possible loss, minimum | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Range of possible loss, maximum | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |
Potential Claim for Pension Advisory Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss | 67,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,000,000 | £ 45
Opry Mills Mall Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |
Amount of coverage for damages contended by the insurers |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |
Difference amount of damages sought by the client |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |
Opry Mills Mall Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  |  |  |  |  |  | $ 204,000,000 |  | $ 200,000,000 |  |  |  |  |
International Road Transport Union [Member] | Litigation Foreign Currency Denominated Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  |  |  |  | SFr 46,000,000 |  |  |  |  |  |  | 47,000,000 |
Damages awarded excluding interest and costs |  |  |  |  |  | $ 17,000,000 | SFr 16,800,000 |  |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  | 28,000,000 | SFr 27,900,000 |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  | $ 13,000,000 | SFr 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement terms maximum liability |  |  |  | 9,000,000 | SFr 8,700,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
International Road Transport Union [Member] | Litigation USD Denominated Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |
Damages awarded excluding interest and costs |  |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement terms maximum liability |  |  |  | $ 115,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Road Transport Union [Member] | Litigation Expenses and Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |
Philips [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of damages sought | 432,000,000 |  |  |  |  |  |  | £ 189 |  |  |  | £ 290 |  |  |  |  | $ 282,000,000 |
Versicherung Aktiengesellschaft [Member] | Litigation Foreign Currency Denominated Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  | $ (2,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  | € (1.6) |  |
Huntington Ingalls Industries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal settlements |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |
Pending Litigation [Member] | Lyttleton Port Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of damages sought | $ 125,900,000 |  | NZD 184 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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