Retirement Plans and Post Retirement Benefits Pension Costs, Assumptions Used in Net Periodic Costs and Expected Contributions and Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ 18.2	$ 21.4
Defined Benefit Plan, Plan Assets, Benefits Paid	18.2	21.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	4.9	4.3	$ 3.8
Interest cost	12.5	13.1	13.1
Expected return on plan assets	(13.1)	(13.1)	(15.0)
Amortization of prior service cost	0.5	0.5	0.5
Amortization of net actuarial loss	6.2	5.4	6.8
Net periodic pension cost	11.0	10.2	9.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	$ 3.1	$ 0.0	$ 0.8
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.90%	4.10%	3.80%
Rate of compensation increase	0.70%	0.70%	0.70%
Expected return on plan assets	5.40%	5.40%	6.00%
Other changes in plan assets and benefit obligations recognized in other comprehensive incom [Abstract]
Net actuarial (gain) loss	$ (3.9)	$ 4.8	$ 0.8
Amortization of net actuarial loss	(9.3)	(5.4)	(7.6)
Amortization of prior service cost	(0.5)	(0.5)	(0.5)
Foreign exchange rate changes	0.0	0.0	(0.1)
Total recognized in OCI	$ (13.7)	$ (1.1)	$ (7.4)
Maximum benefit amortization period	20 years
Approximate percentage of assets represented by most significant plans	78.00%
Approximate percentage of benefit obligations represented by most significant plans	83.00%
Rate of eligible compensation increase	4.00%