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Restructuring Activities (Restructuring Rollforward) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Restructuring Reserve [Roll Forward]        
Restructuring costs $ 0.0 $ 2.5 $ 0.0 $ 7.1
Restructuring and impairment costs 0.0 22.6 0.0 42.6
Amounts paid     (4.3) (27.5)
2017 Plan [Member]        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     3.3 0.0
Restructuring and impairment costs       2.0
Amounts paid     (2.5) (0.4)
Restructuring reserve, ending balance 0.8 1.6 0.8 1.6
2017 Plan [Member] | Severance and employee related [Member]        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     3.3 0.0
Restructuring and impairment costs       1.7
Amounts paid     (2.5) (0.1)
Restructuring reserve, ending balance 0.8 1.6 0.8 1.6
2017 Plan [Member] | Exit or disposal activities [Member]        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     0.0 0.0
Restructuring and impairment costs       0.3
Amounts paid       (0.3)
Restructuring reserve, ending balance 0.0 0.0 0.0 0.0
2016 Plan [Member]        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     1.7 2.0
Restructuring and impairment costs       47.0
Amounts paid     (1.3) (24.7)
Charges against assets       (8.6)
Restructuring reserve, ending balance 0.4 15.7 0.4 15.7
2016 Plan [Member] | Severance and employee related [Member]        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     0.3 0.8
Restructuring and impairment costs       3.0
Amounts paid     (0.3) (3.0)
Restructuring reserve, ending balance 0.0 0.8 0.0 0.8
2016 Plan [Member] | Impairment of property and equipment [Member]        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     0.0 0.0
Restructuring and impairment costs       4.6
Charges against assets       (4.6)
Restructuring reserve, ending balance 0.0 0.0 0.0 0.0
2016 Plan [Member] | Exit or disposal activities [Member]        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     1.4 1.2
Restructuring and impairment costs       39.4
Amounts paid     (1.0) (21.7)
Charges against assets       (4.0)
Restructuring reserve, ending balance $ 0.4 $ 14.9 $ 0.4 $ 14.9