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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015
Fair value measurements
Common units purchased	400,000
Proceeds from sale of available-for-sale securities		$ 0.0	$ 42.1
Receivable for sale of available-for-sale securities included in prepaid expenses and other current assets	$ 25.9	25.9
Aggregate cost basis	47.9	47.9
Other income, net		0.3	$ 36.0
Aggregate cost basis, AFS securities reclassified to trading securities	$ 25.7	25.7
Reclassification out of AOCI | Accumulated Net Unrealized Investment Gain (Loss)
Fair value measurements
Other income, net		20.1
Reclassification out of AOCI | Accumulated Net Unrealized Investment Gain (Loss) Transfered to Trading Securities
Fair value measurements
Other income, net		$ 11.7

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+ 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

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Amount of income (expense) related to nonoperating activities, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

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