Pension and Postretirement Health Care (Net Periodic Pension Expense (Benefit)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension Plan
Defined Benefit plan Net periodic benefit cost
Settlement Expense		$ 0.0		$ 0.0
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	$ 1.0	0.9	$ 2.8	2.6
Interest Cost	1.3	1.3	3.9	3.9
Amortization
Net Actuarial Loss (Gain)	1.5	1.5	4.3	4.4
Prior Service Cost	0.1	0.0	0.1	0.1
Net Periodic Pension Expense	3.9	3.7	11.1	11.0
Postretirement Health Care Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	0.1	0.0	0.1	0.1
Interest Cost	0.3	0.4	1.1	1.1
Amortization
Net Actuarial Loss (Gain)	0.0	0.0	0.0	0.0
Net Periodic Pension Expense	0.4	0.4	1.2	1.2
U.S. Plan | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	9.6	9.3	28.8	28.0
Interest Cost	11.4	11.5	34.4	34.4
Expected Return on Plan Assets	(23.4)	(23.6)	(70.4)	(70.8)
Amortization
Net Actuarial Loss (Gain)	4.7	4.7	14.3	14.1
Prior Service Cost	(0.1)	(0.1)	(0.3)	(0.3)
Net Periodic Pension Expense	2.2	1.8	6.8	5.4
Non U.S. Plans | Pension Plan
Defined Benefit plan Net periodic benefit cost
Interest Cost	1.0	1.2	2.9	3.7
Expected Return on Plan Assets	(1.1)	(1.2)	(3.3)	(3.7)
Settlement Expense	0.7		0.9
Amortization
Net Actuarial Loss (Gain)	0.4	0.3	1.0	0.8
Net Periodic Pension Expense	$ 1.0	$ 0.3	$ 1.5	$ 0.8