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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 16, 2015 | Dec. 01, 2015 | Nov. 30, 2015 | May. 31, 2015 | Nov. 30, 2014 | Sep. 30, 2010 | [1] | Oct. 01, 2009
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Subsequent Event [Line Items] |  |  |  |  |  |  |
Authorized stock purchase amount under modified Dutch auction offer |  |  |  |  |  | $ 44.0 | $ 200.0
Par value per share of stock to be repurchased (in Dollars per share) |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Common Class A |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Par value per share of stock to be repurchased (in Dollars per share) |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Subsequent Event | Common Class A |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividend declared per share (in Dollars per share) |  | $ 0.15 |  |  |  |  |
Subsequent Event | Common Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Authorized stock purchase amount under modified Dutch auction offer | $ 200.0 |  |  |  |  |  |
Par value per share of stock to be repurchased (in Dollars per share) | $ 0.01 |  |  |  |  |  |
[1] | Represents the remainder of a $200.0 authorization after giving effect to the purchase of 5,199,699 shares at $30.00 per share pursuant to a large share repurchase in the form of a modified Dutch auction tender offer that was completed by the Company on November 3, 2010 for a total cost of $156.0, excluding related fees and expenses.

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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