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Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |  |
Amortized Cost | $ 0.8 | $ 35.8 |
Fair Value | 0.8 | 35.8 |
Redemptions of Available-For-Sale Securities | 35.0 | 10.7 | $ 109.8
Proceeds from Sale of Available-For-Sale Securities | 0.0 | 0.0 | 9.5
Proceeds from Dividends Received | 0.4 | 0.0 | 0.0
Commercial Paper [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost |  | 35.0 |
Fair Value | 0.0 | 35.0 |
U.S. Treasury Bills [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 0.8 | 0.8 |
Fair Value | 0.8 | 0.8 |
TN-BC Holdings, LLC [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Payments to Acquire Interest in Joint Venture | 2.1 |  |
Mercury Finance [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Equity Contributions to Other Existing Joint Ventures | $ 1.6 | $ 1.0 | $ 0.6

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- Definition This item represents the cost of debt 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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