Investments - Amortized Cost Basis (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities [Abstract]
Available-for-sale securities, amortized cost	$ 59.3	$ 58.6
Available-for-sale securities, accumulated gross unrealized gains	0.1	0.3
Available-for-sale securities, accumulated gross unrealized losses	(1.0)	(1.5)
Available-for-sale debt securities	58.4	57.4
Trading Securities [Abstract]
Trading securities, amortized cost	8.9	7.1
Trading securities, accumulated gross unrealized gains	4.9	3.1
Trading securities, accumulated gross unrealized losses	0.0	0.0
Trading securities	13.8	10.2
Investments, amortized cost	68.2	65.7
Investments, accumulated unrealized gains	5.0	3.4
TOTAL INVESTMENTS	$ 72.2	$ 67.6

Marketable Securities, Amortized Cost

No definition available.

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- Definition

The amount of gross unrealized gains for securities, at a point in time, which are categorized either as available for sale or trading securities.

+ References

No definition available.

+ Details

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- Definition

Trading Securities, Accumulated Gross Unrealized Gain, before Tax

+ References

No definition available.

+ Details

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- Definition

Trading Securities, Accumulated Gross Unrealized Loss, before Tax

+ References

No definition available.

+ Details

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- Definition

Trading Security, Amortized Cost

+ References

No definition available.

+ Details

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

+ Details

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

+ Details

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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

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- References

No definition available.

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- Definition

Amount of debt 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
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-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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- References

No definition available.

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