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Property, Plant And Equipment Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 23, 2018
Feb. 24, 2017
Feb. 26, 2016
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net $ 435.1 $ 408.1  
Depreciation 64.5 59.3 $ 63.3
Construction in Progress, Estimated Cost to Complete 15.4 21.6  
Assets Held-for-sale, Not Part of Disposal Group 13.4    
Impairment of Long-Lived Assets to be Disposed of 1.5    
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net 183.4 184.7  
Building and Building Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net $ 116.0 $ 110.2