Pension and Other Post Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2017	Jun. 30, 2016	Jun. 29, 2017	Jun. 30, 2016
Other Benefits [Member]
Pension and Other Post-Retirement Benefits
Service cost	$ 0.3	$ 0.4	$ 0.6	$ 0.9
Interest cost	0.3	0.5	0.6	1.1
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.3)	(0.5)	(0.5)	(0.5)
Amortization of net loss	(0.5)	0.0	(1.1)	0.0
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	0.0	0.0	0.0	3.1
Net periodic pension income	(0.2)	0.4	(0.4)	4.6
Pension Plan [Member]
Pension and Other Post-Retirement Benefits
Service cost	0.3	0.3	0.5	0.6
Interest cost	9.3	11.4	18.9	23.1
Expected return on plan assets	(18.1)	(19.8)	(36.4)	(39.3)
Amortization of net loss	0.0	1.7	0.0	2.4
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	0.0	0.0	0.0	10.9
Net periodic pension income	(8.5)	$ (6.4)	(17.0)	$ (2.3)
U.K. pension plan [Member] | Pension Plan [Member]
Pension [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	0.0		0.0
Domestic Plan [Member] | Supplemental Employee Retirement Plan [Member]
Pension [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 8.6		$ 8.6