Corporate Office Relocation	12 Months Ended
Corporate Office Relocation	Dec. 31, 2014
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 is occurring in phases over time and is expected to be substantially complete in 2015. We recorded employee severance, retention, relocation, and related costs of $7.6 million and $15.0 million in 2014 and 2013, respectively. We also recorded lease exit and asset impairment costs totaling $8.7 million and $0.4 million in 2014 and 2013, respectively. Severance, retention, relocation, and related costs are recorded within selling, general, and administrative expense, while lease exit and asset impairments are included in other expense, net. We expect the remaining costs to total less than $15.0 million. We have also incurred costs at the new location related to the recruitment and onboarding of new employees and certain redundant operating costs, the amount of which has not been material.

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.

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