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Acquisitions Purchase Price Allocation (Details)
$ in Millions
Jan. 28, 2017
USD ($)
Business Acquisition [Line Items]  
Accounts receivable $ 16.9
Costs and estimated earnings in excess of billings 24.0
Inventories and other current assets 11.9
Property and equipment 11.5
Goodwill 40.9
Total assets 201.5
Accounts payable 23.7
Accrued and other liabilities 22.4
Total liabilities 46.1
Net Assets Acquired 155.4
Customer relationships  
Business Acquisition [Line Items]  
Intangible assets 94.5
Trade names  
Business Acquisition [Line Items]  
Intangible assets $ 1.8