Pension and Other Post-Retirement Benefit Plans (Changes in Projected Benefit Obligations, Fair Value of Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts recognized in balance sheet
Liability, Defined Benefit Plan, Noncurrent	$ 368.6	$ 298.9
Other Post-retirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning balance	9.5	10.0
Interest cost	0.5	0.4	$ 0.3
Actuarial (gain) loss	1.4	(0.2)
Amendments		0.1
Settlements		(0.1)
Foreign currency exchange rate changes	(0.1)
Benefits paid	(0.5)	(0.5)
Other	(0.2)	(0.2)
Projected benefit obligation, ending balance	10.6	9.5	10.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status of the plans (liability) at December 31	(10.6)	(9.5)
Amounts recognized in balance sheet
Liability, Defined Benefit Plan, Noncurrent	10.0	8.8
Funded status recognized in the consolidated balance sheets at December 31	(10.6)	(9.5)
Liability, Defined Benefit Plan, Current	0.6	0.7
Pre-tax amounts recognized in accumulated other comprehensive (income) loss
Unrecognized actuarial (gain) loss	1.9	0.6
Accumulated other comprehensive (income) loss at December 31	1.9	0.6
Plans with underfunded or non-funded projected benefit obligation
Defined Benefit Plan, Plan with Projected Benefit Obligations in Excess of Plan Assets, Projected Benefit Obligation	10.7	9.5
International | Pensions
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Accumulated benefit obligation	773.3	664.3
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning balance	753.4	898.1
Service cost	16.3	21.2	21.0
Interest cost	18.3	20.9	19.6
Actuarial (gain) loss	102.8	(40.0)
Amendments	0.9	2.7
Curtailments		(4.0)
Settlements	(0.6)	(89.0)
Foreign currency exchange rate changes	11.1	(25.7)
Plan participants’ contributions	1.1	1.2
Benefits paid	(25.7)	(31.7)
Other	3.4	(0.3)
Projected benefit obligation, ending balance	881.0	753.4	898.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	570.6	699.2
Actual return on plan assets	89.1	(16.0)
Company contributions	6.9	18.5
Foreign currency exchange rate changes	13.5	(20.9)
Settlements		(87.6)
Plan participants’ contributions	1.1	1.2
Benefits paid	(19.6)	(23.3)
Other	(3.8)	(0.5)
Fair value of plan assets, ending balance	657.8	570.6	699.2
Funded status of the plans (liability) at December 31	(223.2)	(182.8)
Amounts recognized in balance sheet
Liability, Defined Benefit Plan, Noncurrent	214.4	174.9
Funded status recognized in the consolidated balance sheets at December 31	(223.2)	(182.8)
Liability, Defined Benefit Plan, Current	8.8	7.9
Pre-tax amounts recognized in accumulated other comprehensive (income) loss
Unrecognized actuarial (gain) loss	90.7	43.7
Unrecognized prior service (credit) cost	7.0	7.0
Accumulated other comprehensive (income) loss at December 31	97.7	50.7
Plans with underfunded or non-funded projected benefit obligation
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	741.2	621.1
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	522.8	439.8
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	292.1	269.2
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets	140.3	126.6
UNITED STATES | Pensions
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Accumulated benefit obligation	669.6
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning balance	598.1
Service cost		0.2	10.3
Interest cost	25.6	23.8	26.7
Actuarial (gain) loss	80.7
Benefits paid	(34.7)
Projected benefit obligation, ending balance	669.7	598.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	477.4
Actual return on plan assets	72.0
Benefits paid	(29.4)
Fair value of plan assets, ending balance	520.0	477.4
Funded status of the plans (liability) at December 31	(149.7)
Amounts recognized in balance sheet
Liability, Defined Benefit Plan, Noncurrent	144.2	115.2
Funded status recognized in the consolidated balance sheets at December 31	(149.7)	(120.7)
Liability, Defined Benefit Plan, Current	5.5	5.5
Pre-tax amounts recognized in accumulated other comprehensive (income) loss
Unrecognized actuarial (gain) loss	121.6	73.2
Accumulated other comprehensive (income) loss at December 31	121.6	73.2
United States Pension Plan [Member] | Pensions
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Accumulated benefit obligation		598.1
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning balance	598.1	659.8
Service cost		0.2
Interest cost		23.8
Actuarial (gain) loss		(47.9)
Amendments		0.3
Settlements		(5.3)
Benefits paid		(32.8)
Projected benefit obligation, ending balance		598.1	659.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	477.4	576.4
Actual return on plan assets		(70.7)
Benefits paid		(28.3)
Fair value of plan assets, ending balance		477.4	$ 576.4
Funded status of the plans (liability) at December 31		(120.7)
Plans with underfunded or non-funded projected benefit obligation
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	668.4	598.1
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	518.8	477.4
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	668.4	598.1
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets	$ 518.8	$ 477.4