Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Weighted-Average Interest Crediting Rate	1.00%	1.00%
Unrecognized net actuarial losses (gains)	$ (393.2)	$ (379.8)	$ (380.6)
Reduction in equity	$ 296.4	282.4	285.1
Defined benefit plan, target allocation percentage of assets, near-term benefit payments	55.00%
Defined benefit plan, target allocation percentage of assets, long-term growth	45.00%
Weighted average expected long-term rate of return on plan assets	5.00%
Company contributions	$ 15.8	$ 15.8	15.1
Defined Benefit Plan, Weighted-Average Interest Crediting Rate Above Minimum Government Rate	0.25%
Percentage of Fixed Income Securities Consisting of Asset-Backed and Mortgage-Backed Securities	9.00%
Alternative Investments
Defined benefit plan, target plan asset allocations	5.00%
Equity Securities
Defined benefit plan, target plan asset allocations	40.00%
Fixed Income Investments
Defined benefit plan, target plan asset allocations	55.00%
Minimum
Percentage of joint venture's unrecognized net actuarial losses and unrecognized prior service cost	20.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	1.75%	1.75%
Maximum
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	5.00%	5.00%
ENPP
Minimum age for vesting	50 years
Minimum participation period to qualify for payment	10 years
Minimum service period to vest	5 years
Minimum age to receive benefits	65 years
Period over which retirement benefits are paid	15 years
Defined Benefit Plan, Amortization Period	7 years
Pension and Other Postretirement Benefit Plans [Member]
Aggregate projected benefit obligation	$ 309.3	$ 847.3
Accumulated benefit obligation	275.2	798.5
Fair value of plan assets	67.8	616.0
Reduction in equity	391.6	378.7
Tax effect of benefit plans	$ 96.3	$ 97.0
Pension Benefits
Percentage of fixed income securities consisting of high-yield securities	14.00%	13.00%
Percentage of Fixed Income Securities Consisting of Foreign Securities	10.00%	17.00%
Unrecognized net actuarial losses (gains)	$ (362.2)	$ (356.7)
Unrecognized prior service cost	22.5	19.5
Net loss recognized due to settlement	$ 0.5	$ 0.9	$ 0.2
Weighted average discount rate	2.00%	2.80%
Benefit payments	$ 47.0
Benefit payments made to defined benefit pension plans and ENPP	45.6
Benefits paid	$ 44.8	$ 45.9
Weighted average expected long-term rate of return on plan assets	4.60%	5.40%	5.80%
Postretirement Benefits
Unrecognized net actuarial losses (gains)	$ (3.9)	$ 0.6
Defined Benefit Plan, Amortization Period	12 years
Unrecognized prior service cost	$ 3.0	$ 3.1
Weighted average discount rate	4.50%	5.20%
Benefit payments	$ 1.6
Benefits paid	$ 1.5	$ 1.4
Brazilian Postretirement Benefit Obligation, Defined Benefit [Member]
Health care cost trend rate assumed	10.55%	10.80%
Ultimate health care cost trend rate	4.80%	5.00%
Benefit payments	$ 0.1
U.S Based Postretirement Health Care and Life Insurance Benefit Plans
Health care cost trend rate assumed	6.25%	6.50%
Ultimate health care cost trend rate	5.00%	5.00%
Benefit payments	$ 1.6
UNITED STATES \| Pension Benefits
Defined Benefit Plan, Amortization Period	15 years
Aggregate projected benefit obligation	$ 172.5	$ 145.6
Accumulated benefit obligation	151.9	128.7
Fair value of plan assets	$ 38.3	$ 36.8
Weighted average discount rate	3.45%	4.35%
Expected minimum contribution	$ 3.6
Defined benefit plan, target allocation percentage of assets, near-term benefit payments	60.00%
Defined benefit plan, target allocation percentage of assets, long-term growth	40.00%
Defined benefit plan, target plan asset allocations	100.00%
Defined benefit plan, assumptions used in investment strategy, expected return next fiscal year	5.50%
Weighted average expected long-term rate of return on plan assets	5.50%	6.00%	6.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	5.00%	5.00%
UNITED STATES \| Pension Benefits \| Equity securities
Defined benefit plan, target plan asset allocations	30.00%
UNITED STATES \| Pension Benefits \| Fixed Income Securities
Defined benefit plan, target plan asset allocations	55.00%
UNITED STATES \| Pension Benefits \| Alternative Investments
Defined benefit plan, target plan asset allocations	10.00%
UNITED STATES \| Pension Benefits \| Defined Benefit Plan, Cash [Member]
Defined benefit plan, target plan asset allocations	5.00%
UNITED STATES \| Postretirement Benefits
Unrecognized net actuarial losses (gains)	$ 1.6	$ 0.3
UNITED KINGDOM \| Pension Benefits
Expected minimum contribution	$ 30.0
Foreign Plan [Member]
Defined benefit plan, target plan asset allocations	100.00%
Foreign Plan [Member] \| U.K. Pension Plans, Defined Benefit
Expected minimum contribution	$ 20.2
Foreign Plan [Member] \| Pension Benefits
Defined benefit plan, target plan asset allocations	100.00%
Foreign Plan [Member] \| Pension Benefits \| Defined Benefit Plan, Cash [Member]
Defined benefit plan, target plan asset allocations	0.00%
Non-US [Domain] \| U.K. Pension Plans, Defined Benefit
Weighted average expected long-term rate of return on plan assets	4.25%
Non-US [Domain] \| Pension Benefits
Defined Benefit Plan, Amortization Period	19 years
Defined benefit plan, historical average return on asset mix	4.75%
Corporate Joint Venture \| GIMA
Reduction in equity	$ (1.6)	(1.1)
Tax effect of benefit plans	$ 0.5	0.4
Percentage of joint venture's unrecognized net actuarial losses and unrecognized prior service cost	50.00%
Net loss recognized due to settlement	$ 0.1	0.1
U.S. and BRAZIL \| Postretirement Benefits
Unrecognized net actuarial losses (gains)	$ 3.9	$ (0.6)

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Percentage Of Fixed Income Securities Consisting Of High-yield Securities

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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