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Commitments and Contingencies (Details Textual) € in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2015 USD ($) | Jan. 21, 2015 USD ($) | Jan. 15, 2014 USD ($) | Jul. 31, 2014 analysts | Dec. 31, 2012 USD ($) | Dec. 31, 2012 EUR (€) | Jun. 30, 2011 USD ($) | Jun. 30, 2011 EUR (€) | Dec. 31, 2003 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Oct. 31, 2005 USD ($) | Oct. 31, 2005 EUR (€)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of equity investment in Rock-McGraw, Inc., percentage |  |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |
Sale Leaseback Transaction, Rent Expense |  |  |  |  |  |  |  |  |  | $ 2.0 | $ 4.0 |  |  |  |
Percentage of leased building space, company |  |  |  |  |  |  |  |  |  |  |  | 17.00% |  |  |
Proceeds from the disposition of equity investment in Rock-McGraw |  |  |  |  |  |  |  |  | $ 382.0 |  |  |  |  |  |
Pre-tax gain from Sale of equity investment in Rock-McGraw |  |  |  |  |  |  |  |  | 131.0 |  |  |  |  |  |
After-tax gain from Sale of equity investment in Rock-McGraw |  |  |  |  |  |  |  |  | 58.0 |  |  |  |  |  |
Pre-tax gain pursuant to sale-leaseback accounting rules |  |  |  |  |  |  |  |  | 212.0 |  |  |  |  |  |
After-tax gain pursuant to sale-leaseback accounting rules |  |  |  |  |  |  |  |  | $ 126.0 |  |  |  |  |  |
Deferred gain |  |  |  |  |  |  |  |  |  | 4.0 | 4.0 | $ 7.0 | $ 60.0 |  |
Gain amortized during year |  |  |  |  |  |  |  |  |  |  |  | 21.0 |  |  |
Accelerated recognition of deferred gain |  |  |  |  |  |  |  |  |  |  |  | 16.0 |  |  |
Interest expense with operating lease |  |  |  |  |  |  |  |  |  | $ 1.0 | $ 1.0 | $ 2.0 |  |  |
Financial Crisis Litigation [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded | $ 687.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Crisis Litigation [Member] | Arizona, Arkansas, California, Connecticut, Colorado, Delaware, Idaho, Illinois, Indiana, Iowa, Maine, Mississippi, Missouri, New Jersey, North Carolina, Pennsylvania, South Carolina, Tennessee and Washington, and the District of Columbia | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded | 687.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Crisis Litigation [Member] | California | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded | $ 125.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Securities and Exchange Commission [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalties awarded |  | $ 58.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Disgorgement and prejudgement interest paid |  | 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Securities and Exchange Commission [Member] | New York and the Commonwealth of Massachusetts [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded |  | $ 19.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Administrative Court [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  | $ 234,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Parmalat Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages claimed |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,100.0 | € 4,100.0
Rating fees paid |  |  |  |  | $ 1.1 | € 1.1 | $ 0.8 | € 0.8 |  |  |  |  |  |  |
Number of analysts served notice of completion | analysts |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |

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