Pension and Postretirement Health Care (Net Periodic Pension Expense (Benefit)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan
Amortization
Contribution to pension plan	$ 50.0	$ 0.0
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	1.1	0.9
Interest Cost	1.3	1.3
Amortization
Net Actuarial Loss (Gain)	1.8	1.4
Net Periodic Pension Expense	4.2	3.6
Postretirement Health Care Plan
Defined Benefit plan Net periodic benefit cost
Interest Cost	0.3	0.4
Amortization
Net Periodic Pension Expense	0.3	0.4
U.S. Plan | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	10.4	9.6
Interest Cost	11.1	11.5
Expected Return on Plan Assets	(22.0)	(23.5)
Amortization
Net Actuarial Loss (Gain)	7.1	4.8
Prior Service Cost	(0.1)	(0.1)
Net Periodic Pension Expense	6.5	2.3
Non U.S. Plans | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	0.4	0.0
Interest Cost	1.0	0.9
Expected Return on Plan Assets	(1.1)	(1.1)
Amortization
Net Actuarial Loss (Gain)	0.3	0.3
Net Periodic Pension Expense	$ 0.6	$ 0.1