Basis of Presentation and Significant Accounting Policies - Presentation and Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Debt issuance costs	$ 73.0	$ 11.8
Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of credit losses reimbursed to freight forwarding by independently owned stations	70.00%
Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of credit losses reimbursed to freight forwarding by independently owned stations	80.00%
Adjustments for New Accounting Pronouncement
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Debt issuance costs		11.8
Deferred Tax Assets, Net, Noncurrent		$ 9.2

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, netted by jurisdiction and classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]

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Percentage Of Credit Losses Reimbursed To Freight Forwarding By Independently Owned Stations

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