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Acquisitions Purchase Price Allocation (Details)
$ in Millions
Oct. 29, 2016
USD ($)
Business Acquisition [Line Items]  
Accounts receivable $ 16.3
Costs and estimated earnings in excess of billings 34.8
Inventories and other current assets 11.8
Property and equipment 11.5
Goodwill 36.9
Total assets 207.6
Accounts payable 23.5
Accrued and other liabilities 26.9
Total liabilities 50.4
Net Assets Acquired 157.2
Trade names  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 1.8
Customer relationships  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 94.5