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Corporate Office Relocation	12 Months Ended
	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Corporate office relocation	Corporate office relocation In May 2013, we announced our plan to relocate our corporate offices to Atlanta, Georgia, from the previous location in Bloomfield Hills, Michigan. The relocation of operations occurred in phases over time and was substantially complete in 2016. We recorded employee severance, retention, relocation, and related expenses of $1.0 million, $2.0 million, and $7.6 million in 2016, 2015, and 2014, respectively. We also recorded lease exit and asset impairment expenses totaling $7.3 million, $2.3 million, and $8.7 million in 2016, 2015, and 2014, respectively. Severance, retention, relocation, and related expenses are recorded within selling, general, and administrative expense, while lease exit and asset impairment expenses are included in other expense, net.

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- References

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- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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