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Summary of Significant Accounting Policies - Impact of Recently Issued Accounting Guidance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impact of Recently Issued Accounting Standards—Adopted
Warehouse, delivery, selling, general and administrative	$ 1,902.8	$ 1,798.1	$ 1,725.3
Other expense, net	$ 4.7	4.0	6.8
Impact of Recently Issued Accounting Standards—Adopted | Improvements to Net Periodic Pension Costs and Net Periodic Postretirement Benefits Cost
Impact of Recently Issued Accounting Standards—Adopted
Warehouse, delivery, selling, general and administrative		(5.2)	(3.2)
Other expense, net		$ 5.2	$ 3.2

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+ 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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+ 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 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311

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