Pension and Other Post-Retirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Post-retirement Benefits
Components of net periodic benefit cost (income):
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	0.3	0.0	0.0
Expected return on plan assets	0.0	0.0	0.0
Settlement cost	0.0	0.0	0.0
Curtailment benefit	0.0	0.0	0.0
Amortization of net actuarial loss (gain)	0.0	0.0	0.0
Amortization of prior service cost (credit)	0.0	0.0	0.0
Net periodic benefit cost (income)	0.3	0.0	0.0
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial gain (loss) arising during period	(0.8)	0.0	0.0
Prior service (cost) credit arising during period	0.0	0.0	0.0
Settlements and curtailments	0.0	0.0	0.0
Amortization of net actuarial loss (gain)	0.0	0.0	0.0
Amortization of prior service cost (credit)	0.0	0.0	0.0
Other	0.0	0.0	0.0
Total recognized in other comprehensive income (loss)	(0.8)	0.0	0.0
U.S. | Pensions
Components of net periodic benefit cost (income):
Service cost	10.3	0.0	0.0
Interest cost	26.7	0.0	0.0
Expected return on plan assets	(45.5)	0.0	0.0
Settlement cost	0.0	0.0	0.0
Curtailment benefit	(26.8)	0.0	0.0
Amortization of net actuarial loss (gain)	0.0	0.0	0.0
Amortization of prior service cost (credit)	0.0	0.0	0.0
Net periodic benefit cost (income)	(35.3)	0.0	0.0
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial gain (loss) arising during period	26.7	0.0	0.0
Prior service (cost) credit arising during period	(0.2)	0.0	0.0
Settlements and curtailments	(26.8)	0.0	0.0
Amortization of net actuarial loss (gain)	0.0	0.0	0.0
Amortization of prior service cost (credit)	0.0	0.0	0.0
Other	0.0	0.0	0.0
Total recognized in other comprehensive income (loss)	(0.3)	0.0	0.0
International | Pensions
Components of net periodic benefit cost (income):
Service cost	21.0	11.7	13.7
Interest cost	19.6	10.9	11.6
Expected return on plan assets	(36.3)	(8.2)	(8.6)
Settlement cost	1.5	0.0	0.0
Curtailment benefit	0.0	(10.7)	0.0
Amortization of net actuarial loss (gain)	2.5	1.0	3.7
Amortization of prior service cost (credit)	1.0	0.7	0.7
Net periodic benefit cost (income)	9.3	5.4	21.1
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial gain (loss) arising during period	43.3	(10.5)	18.4
Prior service (cost) credit arising during period	0.1	0.1	0.3
Settlements and curtailments	1.5	(10.7)	0.0
Amortization of net actuarial loss (gain)	2.5	1.0	3.7
Amortization of prior service cost (credit)	1.0	0.7	0.7
Other	(5.1)	17.6	8.1
Total recognized in other comprehensive income (loss)	$ 43.3	$ (1.8)	$ 31.2