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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Unrecognized net actuarial losses |  |  | $ 404.8 | $ 336.6 | $ 341.5 |
Reduction in equity |  |  | $ 304.5 | 249.0 | 253.3 |
Defined benefit plan, target allocation percentage of assets, near-term benefit payments |  |  | 30.00% |  |  |
Defined benefit plan, target allocation percentage of assets, long-term growth |  |  | 70.00% |  |  |
Company contributions |  |  | $ 11.6 | 12.0 | 13.3 |
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% |  |  |
Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |  |
Unrecognized net actuarial losses |  |  | $ 403.5 | 335.2 |  |
Aggregate projected benefit obligation |  |  | 877.6 | 869.2 |  |
Accumulated benefit obligation |  |  | 823.8 | 816.9 |  |
Fair value of plan assets |  |  | 600.9 | 627.9 |  |
Tax effect of benefit plans |  |  | 99.8 | 87.1 |  |
Pension Benefits |  |  |  |  |  |
Unrecognized net actuarial losses |  |  | 384.7 | 319.0 |  |
Net prior service (credit) cost |  |  | 13.4 | 11.2 |  |
Net loss recognized due to settlement |  |  | $ 0.4 | $ 0.2 | $ 0.4 | [1]
Weighted average discount rate |  |  | 2.70% | 3.60% |  |
Benefit payments in 2017 (less than) |  |  | $ 41.9 |  |  |
Benefit payments made to defined benefit pension plans and ENPP |  |  | 47.9 |  |  |
Benefit payments made |  |  | $ 44.1 | $ 50.8 |  |
Weighted average expected long-term rate of return on plan assets |  |  | 6.80% | 6.80% | 6.90% |
Pension Benefits | Forecast |  |  |  |  |  |
Net actuarial (gain) loss that will be amortized from accumulated other comprehensive loss |  | $ 12.0 |  |  |  |
Net prior service (credit) cost that will be amortized from accumulated other comprehensive loss |  | $ (1.2) |  |  |  |
U.S. Based Pension Benefit Plans |  |  |  |  |  |
Aggregate projected benefit obligation |  |  | $ 118.1 | $ 112.2 |  |
Accumulated benefit obligation |  |  | 101.9 | 98.4 |  |
Fair value of plan assets |  |  | $ 36.2 | $ 38.1 |  |
Weighted average discount rate |  |  | 4.25% | 4.60% |  |
Expected minimum contribution |  |  | $ 2.2 |  |  |
Defined benefit plan, target allocation percentage of assets, near-term benefit payments |  |  | 15.00% |  |  |
Defined benefit plan, target allocation percentage of assets, long-term growth |  |  | 85.00% |  |  |
Defined benefit plan, assumptions used in investment strategy, expected return next fiscal year |  |  | 6.70% |  |  |
Weighted average expected long-term rate of return on plan assets | [2] |  | 6.00% | 6.00% | 7.00% |
U.S. Based Pension Benefit Plans | Large and small cap domestic equity securities |  |  |  |  |  |
Defined benefit plan, target plan asset allocations |  |  | 30.00% |  |  |
U.S. Based Pension Benefit Plans | International equity securities |  |  |  |  |  |
Defined benefit plan, target plan asset allocations |  |  | 12.00% |  |  |
U.S. Based Pension Benefit Plans | Fixed Income Securities |  |  |  |  |  |
Defined benefit plan, target plan asset allocations |  |  | 44.00% |  |  |
U.S. Based Pension Benefit Plans | Alternative Investments |  |  |  |  |  |
Defined benefit plan, target plan asset allocations |  |  | 14.00% |  |  |
Non-U.S. Pension Benefit Plans |  |  |  |  |  |
Expected minimum contribution |  |  | $ 26.6 |  |  |
Defined benefit plan, historical average return on asset mix |  |  | 6.30% |  |  |
U.K. Pension Plans, Defined Benefit |  |  |  |  |  |
Expected minimum contribution |  |  | $ 19.0 |  |  |
Weighted average expected long-term rate of return on plan assets |  |  | 6.00% |  |  |
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 |  |  |
Period considered when determining retirement benefits |  |  | 3 years |  |  |
Minimum service period |  |  | 20 years |  |  |
Final years of service |  |  | 10 years |  |  |
Postretirement Benefits |  |  |  |  |  |
Unrecognized net actuarial losses |  |  | $ 2.0 | $ 1.4 |  |
Net prior service (credit) cost |  |  | 3.4 | $ 3.6 |  |
Net actuarial (gain) loss that will be amortized from accumulated other comprehensive loss |  |  | 0.1 |  |  |
Net prior service (credit) cost that will be amortized from accumulated other comprehensive loss |  |  | $ (0.2) |  |  |
Weighted average discount rate |  |  | 5.30% | 5.10% |  |
Benefit payments in 2017 (less than) |  |  | $ 1.6 |  |  |
Benefit payments made |  |  | $ 1.2 | $ 1.2 |  |
Brazilian Postretirement Benefit Obligation, Defined Benefit |  |  |  |  |  |
Health care cost trend rate assumed |  |  | 11.80% | 12.60% |  |
Ultimate health care cost trend rate |  |  | 6.10% | 6.80% |  |
Benefit payments in 2017 (less than) |  |  | $ 0.1 |  |  |
U.S Based Postretirement Health Care and Life Insurance Benefit Plans |  |  |  |  |  |
Health care cost trend rate assumed |  |  | 7.00% | 7.25% |  |
Ultimate health care cost trend rate |  |  | 5.00% |  |  |
Benefit payments in 2017 (less than) |  |  | $ 1.5 |  |  |
Minimum |  |  |  |  |  |
Percentage of joint venture's unrecognized net actuarial losses and unrecognized prior service cost |  |  | 20.00% |  |  |
GIMA | Corporate Joint Venture |  |  |  |  |  |
Unrecognized net actuarial losses |  |  |  | $ 1.4 |  |
Reduction in equity |  |  | $ 1.3 |  |  |
Tax effect of benefit plans |  |  | $ 0.5 | $ 0.5 |  |
Percentage of joint venture's unrecognized net actuarial losses and unrecognized prior service cost |  |  | 50.00% | 50.00% |  |
Net loss recognized due to settlement |  |  | $ 0.1 | $ 0.1 |  |
[1] | Rounding may impact summation of amounts.
[2] | Applicable for U.S. funded, qualified plans.

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- Definition The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j-k) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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