Pension and Other Post-Retirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pensions | International
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Service cost	$ 16.3	$ 21.2	$ 21.0
Interest cost	18.3	20.9	19.6
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	33.5	41.2	36.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(0.3)	(0.4)	(1.5)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment		3.8
Defined Benefit Plan, Amortization of Gain (Loss)	(0.7)	(0.6)	(2.5)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	1.0	1.3	1.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	3.1	(0.6)	9.3
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(47.3)	(15.3)	43.3
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0.9	2.7	(0.1)
Settlements and curtailments	0.3	(3.4)	1.5
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(0.7)	(0.6)	(2.5)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	1.0	1.3	1.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	0.8	(1.4)	5.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	47.0	18.1	(43.3)
Pensions | UNITED STATES
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Service cost		0.2	10.3
Interest cost	25.6	23.8	26.7
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	41.6	50.1	45.5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		(0.4)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment			26.8
Defined Benefit Plan, Amortization of Gain (Loss)	(1.8)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(14.2)	(25.7)	(35.3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(50.2)	(73.5)	26.7
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax		(0.2)	0.2
Settlements and curtailments		0.4	(26.8)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(1.8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	48.4	72.9	0.3
Other Post-retirement Benefits
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Interest cost	0.5	0.4	0.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	0.5	0.4	0.3
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax			(0.8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	0.1	0.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	$ 0.1	$ 0.1	$ 0.8