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Accounting Policies - Recently Adopted Accounting Standards (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 03, 2016
Jul. 02, 2017
Jan. 01, 2017
Dec. 31, 2016
New Accounting Pronouncements        
Tax benefit of stock awards exercised $ 0.2      
Non-current deferred tax asset   $ 2.7   $ 3.0
Noncurrent deferred tax liability   $ 51.2   48.6
Previously Reported        
New Accounting Pronouncements        
Current deferred tax assets       38.6
Non-current deferred tax asset       1.5
Noncurrent deferred tax liability       85.7
Accounting Standards Update 2015-17 | Adjustment        
New Accounting Pronouncements        
Non-current deferred tax asset       1.5
Noncurrent deferred tax liability       $ 38.6
Accounting Standars Update 2016-09        
New Accounting Pronouncements        
Cumulative effect adjustment     $ 0.5