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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | $ 54.7 | $ 53.9
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (0.1) | (0.3)
Estimated Fair Value | 54.6 | 53.6
US Government and Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 30.6 | 22.3
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (0.1) | (0.2)
Estimated Fair Value | 30.5 | 22.1
Corporate Bonds [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 11.6 | 3.1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (0.1)
Estimated Fair Value | 11.6 | 3.0
Commercial Paper [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 8.4 | 23.9
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 8.4 | 23.9
Certificates of Deposit [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 4.1 | 4.6
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 4.1 | $ 4.6

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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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