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Restricted Securities Available For Sale (Schedule Of Restricted Securities Available For Sale By Aging Category) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value Less than 12 Months | $ 15.0 | $ 26.0
Gross Unrealized Losses Less than 12 Months | (0.1) | (0.3)
Estimated Fair Value 12 Months or More | 2.0 |
Gross Unrealized Losses 12 Months or More | (0.1) |
Total Estimated Fair Value | 17.0 | 26.0
Total Gross Unrealized Losses | (0.2) | (0.3)
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value Less than 12 Months | 6.9 | 10.0
Total Estimated Fair Value | 6.9 | 10.0
US Government And Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value Less than 12 Months | 5.8 | 11.8
Gross Unrealized Losses Less than 12 Months | (0.1) | (0.2)
Estimated Fair Value 12 Months or More | 1.1 |
Total Estimated Fair Value | 6.9 | 11.8
Total Gross Unrealized Losses | (0.1) | (0.2)
Certificates Of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value Less than 12 Months | 1.0 | 1.9
Total Estimated Fair Value | 1.0 | 1.9
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value Less than 12 Months | 1.3 | 2.3
Gross Unrealized Losses Less than 12 Months |  | (0.1)
Estimated Fair Value 12 Months or More | 0.9 |
Gross Unrealized Losses 12 Months or More | (0.1) |
Total Estimated Fair Value | 2.2 | 2.3
Total Gross Unrealized Losses | $ (0.1) | $ (0.1)

X
- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale impacting investments. + References No definition available. + Details
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X
- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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