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Retirement Benefit Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Amortization $ (0.2) $ 0.8
Pension benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2.6 2.6
Interest cost 1.4 1.4
Expected return on plan assets (1.1) (1.2)
Settlements and Curtailments 0.1 0.8
Net amortization 0.0 0.3
Net periodic benefit cost 3.0 3.9
Post-retirement benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.0 0.0
Interest cost 0.1 0.2
Expected return on plan assets 0.0 0.0
Settlements and Curtailments 0.0 0.0
Net amortization (0.3) (0.3)
Net periodic benefit cost (0.2) (0.1)
Other Nonoperating Income (Expense) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net periodic benefit cost $ 0.2 $ 1.2