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Shareholders' Equity (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 1.875% Convertible Senior Notes [Member] | Sep. 30, 2014 4.0% Convertible Senior Notes [Member] | Apr. 29, 2009 4.0% Convertible Senior Notes [Member] | Sep. 30, 2014 Current Stock Repurchase Program [Member] Class A Common Stock [Member] | Apr. 27, 2011 Current Stock Repurchase Program [Member] Class A Common Stock [Member]
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Class of Stock [Line Items] |  |  |  |  |
Debt instrument stated percentage | 1.875% | 4.00% | 4.00% |  |
Stock repurchase program, authorized |  |  |  | $ 300.0 | $ 300.0
Stock repurchase program, remaining authorization |  |  |  | $ 150.0 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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