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Organization, Description of Business and Basis of Presentation - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments (in segments) | segment			2
Share-based compensation, excess tax benefit			$ 9.8
Total minimum lease payments					$ 2,144.3
Reclassification of net periodic benefit cost	$ (3,700.3)	$ (3,545.0)	$ (10,701.5)	$ (10,541.3)
Pro Forma | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of net periodic benefit cost					$ 25.0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

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-Section 50
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