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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 46.0 | $ 48.5
Gross Unrealized Gains | 0.6 | 0.0
Gross Unrealized Losses | 0.0 | (0.2)
Estimated Fair Value | 46.6 | 48.3
US Government and Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 20.7 | 21.8
Gross Unrealized Gains | 0.3 | 0.0
Gross Unrealized Losses | 0.0 | (0.1)
Estimated Fair Value | 21.0 | 21.7
Corporate Bond Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 15.7 | 17.1
Gross Unrealized Gains | 0.3 | 0.0
Gross Unrealized Losses | 0.0 | (0.1)
Estimated Fair Value | 16.0 | 17.0
Asset-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 5.1 | 5.5
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 |
Estimated Fair Value | 5.1 | 5.5
Mortgage-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 3.8 | 4.1
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 3.8 | $ 4.1
Commercial Paper [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 0.7 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Estimated Fair Value | $ 0.7 |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 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 Reference 2: 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=49124121&loc=d3e5086-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph b -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 9 + Details
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