Defined Benefit Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 1.4	$ 1.2
Interest cost	3.2	3.3
Expected return on plan assets	(3.3)	(3.3)
Amortization of prior service cost 1	0.2	0.1
Amortization of net loss 1	1.4	1.4
Net periodic pension cost	2.9	2.7
Pension Expense	2.9	$ 2.7
Pension Contributions	1.5
Minimum [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	7.0
Maximum [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 9.0