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Employee Benefit and Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets | Summary of under-funded or non-funded pension benefit plans with projected benefit obligations in excess of plan assets at December 31, (in millions):
|  | Pension Benefits |
|  | 2017 |  |  | 2016 |
Projected benefit obligation |  | $ | 1,938.2 |  |  | $ | 1,941.9 |
Fair value of plan assets |  |  | 1,489.9 |  |  |  | 1,449.5 |
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets | Summary of pension plans with accumulated obligations in excess of plan assets at December 31, (in millions):
|  | Pension Benefits |
|  | 2017 |  |  | 2016 |
Accumulated benefit obligation |  | $ | 1,929.6 |  |  | $ | 1,933.2 |
Fair value of plan assets |  |  | 1,489.9 |  |  |  | 1,449.5 |
Schedule of Expected Benefit Payments | Estimated future benefit payments under the Company’s defined benefit pension plans and postretirement benefit plans are as follows as of December 31, 2017 (in millions):
|  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | Thereafter |
Pension benefits |  | $ | 127.8 |  |  | $ | 126.9 |  |  | $ | 128.9 |  |  | $ | 128.6 |  |  | $ | 128.1 |  |  | $ | 627.6 |
Postretirement benefits |  | $ | 5.9 |  |  | $ | 5.9 |  |  | $ | 5.8 |  |  | $ | 5.8 |  |  | $ | 5.7 |  |  | $ | 24.5 |
Pension Benefits [Member] |
Schedule of Reconciliation of Benefit Obligations | The following provides a reconciliation of benefit obligations, plan assets and funded status of the Company’s noncontributory defined benefit pension plans, including the SERP, as of December 31, (dollars in millions):
|  | Pension Benefits |  |  | Postretirement Benefits |
|  | U.S. |  |  | International |  |  |  |  |  |  |
Change in benefit obligation: |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Benefit obligation at beginning of year |  | $ | 1,592.2 |  |  | $ | 937.7 |  |  | $ | 647.4 |  |  | $ | 613.6 |  |  | $ | 74.6 |  |  | $ | 67.9 |
Service cost |  |  | 2.8 |  |  |  | 2.7 |  |  |  | 7.5 |  |  |  | 6.6 |  |  |  | 0.1 |  |  |  | 0.1 |
Interest cost |  |  | 50.5 |  |  |  | 45.1 |  |  |  | 13.6 |  |  |  | 17.5 |  |  |  | 2.2 |  |  |  | 2.2 |
Actuarial (gain) loss |  |  | 84.9 |  |  |  | (16.3 | ) |  |  | 1.8 |  |  |  | 104.2 |  |  |  | (0.4 | ) |  |  | 3.0 |
Amendments |  |  | — |  |  |  | — |  |  |  | 0.4 |  |  |  | — |  |  |  | (5.0 | ) |  |  |  |
Currency translation |  |  | — |  |  |  | — |  |  |  | 72.2 |  |  |  | (107.9 | ) |  |  | — |  |  |  | — |
Benefits paid |  |  | (103.0 | ) |  |  | (98.2 | ) |  |  | (24.0 | ) |  |  | (25.3 | ) |  |  | (6.4 | ) |  |  | (6.1 | )
Acquisitions and dispositions, net |  |  | — |  |  |  | 721.2 |  |  |  | (13.9 | ) |  |  | 64.8 |  |  |  | — |  |  |  | 7.2 |
Curtailments, settlements and other |  |  | (41.2 | ) |  |  | — |  |  |  | (16.1 | ) |  |  | (26.1 | ) |  |  | — |  |  |  | 0.3 |
Benefit obligation at end of year (1) |  | $ | 1,586.2 |  |  | $ | 1,592.2 |  |  | $ | 688.9 |  |  | $ | 647.4 |  |  | $ | 65.1 |  |  | $ | 74.6 |
Schedule of Changes in Fair Value of Plan Assets |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 1,230.6 |  |  | $ | 722.9 |  |  | $ | 565.3 |  |  | $ | 560.3 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  |  | 171.5 |  |  |  | 70.7 |  |  |  | 24.3 |  |  |  | 112.4 |  |  |  | — |  |  |  | — |
Contributions |  |  | 13.2 |  |  |  | 12.0 |  |  |  | 16.1 |  |  |  | 16.4 |  |  |  | — |  |  |  | — |
Currency translation |  |  | — |  |  |  | — |  |  |  | 60.8 |  |  |  | (105.9 | ) |  |  | — |  |  |  | — |
Benefits paid |  |  | (103.0 | ) |  |  | (98.2 | ) |  |  | (24.0 | ) |  |  | (25.3 | ) |  |  | — |  |  |  | — |
Acquisitions and dispositions, net |  |  | — |  |  |  | 523.2 |  |  |  | (5.5 | ) |  |  | 34.0 |  |  |  | — |  |  |  | — |
Settlements and other |  |  | (41.2 | ) |  |  | — |  |  |  | (15.8 | ) |  |  | (26.6 | ) |  |  | — |  |  |  | — |
Fair value of plan assets at end of year |  | $ | 1,271.1 |  |  | $ | 1,230.6 |  |  | $ | 621.2 |  |  | $ | 565.3 |  |  | $ | — |  |  | $ | — |
Funded status at end of year |  | $ | (315.1 | ) |  | $ | (361.6 | ) |  | $ | (67.7 | ) |  | $ | (82.1 | ) |  | $ | (65.1 | ) |  | $ | (74.6 | )
Amounts recognized in the Consolidated Balance Sheets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid benefit cost, included in other assets |  | $ | — |  |  | $ | — |  |  | $ | 65.4 |  |  | $ | 48.7 |  |  | $ | — |  |  | $ | — |
Accrued current benefit cost—other accrued liabilities |  |  | (12.9 | ) |  |  | (12.5 | ) |  |  | (5.1 | ) |  |  | (4.4 | ) |  |  | (5.8 | ) |  |  | (6.4 | )
Accrued noncurrent benefit cost— other noncurrent liabilities |  |  | (302.2 | ) |  |  | (349.1 | ) |  |  | (128.0 | ) |  |  | (126.4 | ) |  |  | (59.3 | ) |  |  | (68.2 | )
Net amount recognized |  | $ | (315.1 | ) |  | $ | (361.6 | ) |  | $ | (67.7 | ) |  | $ | (82.1 | ) |  | $ | (65.1 | ) |  | $ | (74.6 | )
Schedule of Assumptions Used |
Assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average assumptions used to determine benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 3.48 | % |  |  | 3.98 | % |  |  | 2.24 | % |  |  | 2.35 | % |  |  | 3.32 | % |  |  | 3.75 | %
Long-term rate of compensation increase |  |  | 2.50 | % |  |  | 2.50 | % |  |  | 3.47 | % |  |  | 3.53 | % |  |  |  |  |  |  | — |
Current health care cost trend rates |  |  | — |  |  |  | — |  |  |  |  |  |  |  | — |  |  |  | 6.70 | % |  |  | 8.67 | %
Ultimate health care cost trend rates |  |  | — |  |  |  | — |  |  |  |  |  |  |  | — |  |  |  | 4.50 | % |  |  | 4.50 | %
Schedule Of Company's Pension Cost And Supplemental Retirement Plans | The components of pension and postretirement benefit expense for 2017, 2016 and 2015 are as follows (dollars in millions):
|  | Pension Benefits |
|  | U.S. |  |  | International |
|  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Service cost |  | $ | 2.8 |  |  | $ | 2.7 |  |  | $ | 3.2 |  |  | $ | 7.5 |  |  | $ | 6.6 |  |  | $ | 5.8 |
Interest cost |  |  | 50.5 |  |  |  | 45.1 |  |  |  | 41.3 |  |  |  | 13.5 |  |  |  | 17.5 |  |  |  | 19.6 |
Expected return on plan assets |  |  | (73.3 | ) |  |  | (69.1 | ) |  |  | (58.0 | ) |  |  | (18.7 | ) |  |  | (20.8 | ) |  |  | (22.1 | )
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | 0.4 |  |  |  | 0.5 |  |  |  | — |
Net actuarial loss |  |  | 23.7 |  |  |  | 21.8 |  |  |  | 26.2 |  |  |  | 2.2 |  |  |  | 2.2 |  |  |  | 3.4 |
Curtailment, settlement and termination (benefit) costs |  |  | (3.7 | ) |  |  | — |  |  |  | 52.1 |  |  |  | 1.3 |  |  |  | 2.9 |  |  |  | 0.4 |
Total expense (income) |  | $ | (0.1 | ) |  | $ | 0.4 |  |  | $ | 64.7 |  |  | $ | 6.2 |  |  | $ | 8.9 |  |  | $ | 7.1 |
Schedule of Assumptions Used, Periodic Benefit Cost |
Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average assumption used to calculate net periodic cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective discount rate for benefit obligations |  |  | 3.98 | % |  |  | 4.06 | % |  |  | 4.00 | % |  |  | 2.12 | % |  |  | 3.29 | % |  |  | 3.03 | %
Effective rate for interest on benefit obligations |  |  | 3.28 | % |  |  | 3.21 | % |  |  | 4.00 | % |  |  | 1.72 | % |  |  | 2.92 | % |  |  | 3.03 | %
Effective rate for service cost |  |  | 3.83 | % |  |  | 4.16 | % |  |  | 4.00 | % |  |  | 2.44 | % |  |  | 3.39 | % |  |  | 3.03 | %
Effective rate for interest on service cost |  |  | 3.38 | % |  |  | 3.67 | % |  |  | 4.00 | % |  |  | 2.38 | % |  |  | 3.35 | % |  |  | 3.03 | %
Long-term rate of return on plan assets |  |  | 6.02 | % |  |  | 6.34 | % |  |  | 7.25 | % |  |  | 2.61 | % |  |  | 3.93 | % |  |  | 3.86 | %
Long-term rate of compensation increase |  |  | 2.50 | % |  |  | 2.50 | % |  |  | 2.50 | % |  |  | 3.53 | % |  |  | 3.51 | % |  |  | 3.60 | %
Schedule of Allocation of Plan Assets | The composition of domestic pension plan assets at December 31, 2017 and 2016 is as follows (in millions):
|  | Plan Assets – Domestic Plans |
|  | December 31, 2017 |
|  | Fair Value Measurements |  |  |  |  |  |  |
Asset Category |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Subtotal |  |  | NAV-based assets |  |  | Total |
Equity securities and funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 129.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 129.8 |  |  | $ | 4.7 |  |  | $ | 134.5 |
International |  |  | 75.5 |  |  |  | — |  |  |  | — |  |  |  | 75.5 |  |  |  | 84.3 |  |  |  | 159.8 |
Fixed income securities and funds |  |  | 395.4 |  |  |  | — |  |  |  | — |  |  |  | 395.4 |  |  |  | 207.5 |  |  |  | 602.9 |
Alternative investments |  |  | 23.8 |  |  |  | — |  |  |  | 18.2 |  |  |  | 42.0 |  |  |  | 131.7 |  |  |  | 173.7 |
Cash and other |  |  | 183.9 |  |  |  | 15.2 |  |  |  | 1.1 |  |  |  | 200.2 |  |  |  | — |  |  |  | 200.2 |
Total |  | $ | 808.4 |  |  | $ | 15.2 |  |  | $ | 19.3 |  |  | $ | 842.9 |  |  | $ | 428.2 |  |  | $ | 1,271.1 |
|  | Plan Assets – Domestic Plans |
|  | December 31, 2016 |
|  | Fair Value Measurements |  |  |  |  |  |  |
Asset Category |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Subtotal |  |  | NAV-based assets |  |  | Total |
Equity securities and funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 149.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 149.8 |  |  | $ | 120.6 |  |  | $ | 270.4 |
International |  |  | 80.4 |  |  |  | — |  |  |  | — |  |  |  | 80.4 |  |  |  | 101.2 |  |  |  | 181.6 |
Fixed income securities and funds |  |  | 372.7 |  |  |  | — |  |  |  | — |  |  |  | 372.7 |  |  |  | 211.0 |  |  |  | 583.7 |
Alternative investments |  |  | 23.5 |  |  |  | — |  |  |  | 19.1 |  |  |  | 42.6 |  |  |  | 123.5 |  |  |  | 166.1 |
Cash and other |  |  | 12.5 |  |  |  | 15.2 |  |  |  | 1.1 |  |  |  | 28.8 |  |  |  | — |  |  |  | 28.8 |
Total |  | $ | 638.9 |  |  | $ | 15.2 |  |  | $ | 20.2 |  |  | $ | 674.3 |  |  | $ | 556.3 |  |  | $ | 1,230.6 |
The Company reclassified as of December 31, 2016, $42.3 of assets previously classified as Level 3 to NAV-based assets in order to reflect the appropriate classification of the assets. The composition of international pension plan assets at December 31, 2017 and 2016 is as follows (in millions):
|  | Plan Assets – International Plans |
|  | December 31, 2017 |
|  | Fair Value Measurements |  |  |  |  |  |  |
Asset Category |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Subtotal |  |  | NAV-based assets |  |  | Total |
Equity securities and funds |  | $ | 38.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 38.8 |  |  | $ | 14.1 |  |  | $ | 52.9 |
Fixed income securities and funds |  |  | 258.8 |  |  |  | — |  |  |  | — |  |  |  | 258.8 |  |  |  | 14.4 |  |  |  | 273.2 |
Cash and other |  |  | 6.7 |  |  |  | 242.9 |  |  |  | 13.7 |  |  |  | 263.3 |  |  |  | 31.8 |  |  |  | 295.1 |
Total |  | $ | 304.3 |  |  | $ | 242.9 |  |  | $ | 13.7 |  |  | $ | 560.9 |  |  | $ | 60.3 |  |  | $ | 621.2 |
|  | Plan Assets – International Plans |
|  | December 31, 2016 |
|  | Fair Value Measurements |  |  |  |  |  |  |
Asset Category |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Subtotal |  |  | NAV-based assets |  |  | Total |
Equity securities and funds |  | $ | 26.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 26.2 |  |  | $ | 44.8 |  |  | $ | 71.0 |
Fixed income securities and funds |  |  | 164.0 |  |  |  | — |  |  |  | 5.3 |  |  |  | 169.3 |  |  |  | 46.3 |  |  |  | 215.6 |
Cash and other |  |  | 4.7 |  |  |  | 217.8 |  |  |  | 13.5 |  |  |  | 236.0 |  |  |  | 42.7 |  |  |  | 278.7 |
Total |  | $ | 194.9 |  |  | $ | 217.8 |  |  | $ | 18.8 |  |  | $ | 431.5 |  |  | $ | 133.8 |  |  | $ | 565.3 |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets | A reconciliation of the change in the fair value measurement of the defined benefit plans’ consolidated assets using significant unobservable inputs (Level 3) for 2017 and 2016 is as follows (in millions):
|  | Total |
Balance, December 31, 2015 |  | $ | 26.9 |
Acquisitions |  |  | 15.7 |
Realized gains |  |  | 2.2 |
Unrealized losses |  |  | (2.5 | )
Purchases, sales, settlements, and other, net |  |  | (3.3 | )
Balance, December 31, 2016 |  | $ | 39.0 |
Realized losses |  |  | (0.7 | )
Unrealized gains |  |  | 3.3 |
Purchases, sales, settlements and other, net |  |  | (8.6 | )
Balance, December 31, 2017 |  | $ | 33.0 |
Postretirement Benefits [Member] |
Schedule Of Company's Pension Cost And Supplemental Retirement Plans |
|  | Postretirement Benefits |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.3 |
Interest cost |  |  | 2.2 |  |  |  | 2.2 |  |  |  | 3.4 |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  |  | (5.2 | ) |  |  | (5.2 | ) |  |  | (6.6 | )
Net actuarial gain |  |  | (3.9 | ) |  |  | (5.2 | ) |  |  | (1.2 | )
Total income |  | $ | (6.8 | ) |  | $ | (8.1 | ) |  | $ | (4.1 | )
Schedule of Assumptions Used, Periodic Benefit Cost |
Assumptions |  |  |  |  |  |  |  |  |  |  |  |
Weighted average assumption used to calculate net periodic cost: |  |  |  |  |  |  |  |  |  |  |  |
Effective discount rate for benefit obligations |  |  | 3.76 | % |  |  | 4.06 | % |  |  | 4.00 | %
Effective rate for interest on benefit obligations |  |  | 3.07 | % |  |  | 3.21 | % |  |  | 4.00 | %
Effective rate for service cost |  |  | 3.25 | % |  |  | 4.16 | % |  |  | 4.00 | %
Effective rate for interest on service cost |  |  | 3.02 | % |  |  | 3.67 | % |  |  | 4.00 | %

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- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets. + 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=82843861&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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