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Restricted Securities Available For Sale (Schedule Of Restricted Securities Available For Sale) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | $ 52.5 | $ 53.9
Gross Unrealized Losses | (0.2) | (0.3)
Total restricted securities available for sale, estimated fair value | 52.3 | 53.6
Commercial Paper [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 24.1 | 23.9
Total restricted securities available for sale, estimated fair value | 24.1 | 23.9
US Government And Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 19.9 | 22.3
Gross Unrealized Losses | (0.1) | (0.2)
Total restricted securities available for sale, estimated fair value | 19.8 | 22.1
Certificates Of Deposit [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 5.1 | 4.6
Total restricted securities available for sale, estimated fair value | 5.1 | 4.6
Corporate Bonds [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 3.4 | 3.1
Gross Unrealized Losses | (0.1) | (0.1)
Total restricted securities available for sale, estimated fair value | $ 3.3 | $ 3.0

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- Definition The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph b -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.4-08(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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