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Pension and Other Postemployment Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Pension Plans [Member] |
Components of Net Periodic Benefit Expense | The components of net periodic benefit expense for the three years ended December 31, 2017 were (in millions):
| 2017 |  | 2016 |  | 2015
Service cost | $ | 10.1 |  |  | $ | 7.8 |  |  | $ | 5.3 |
Interest cost | 7.9 |  |  | 7.8 |  |  | 7.6 |
Expected return on plan assets | (3.6 | ) |  | (3.7 | ) |  | (4.0 | )
Amortization of prior service cost | 4.6 |  |  | 4.5 |  |  | 4.3 |
Amortization of actuarial losses | 7.0 |  |  | 5.3 |  |  | 5.7 |
| $ | 26.0 |  |  | $ | 21.7 |  |  | $ | 18.9 |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Expense | The weighted average assumptions used to determine net periodic benefit expense for the three years ended December 31, 2017 were:
| 2017 |  | 2016 |  | 2015
Discount rate | 3.5 | % |  | 3.7 | % |  | 3.5 | %
Compensation increases | 2.0 | % |  | 2.0 | % |  | 1.9 | %
Expected return on plan assets | 5.3 | % |  | 4.8 | % |  | 5.7 | %
Benefit Obligation, Fair Value of Plan Assets and Funded Status of Defined Benefit Pension Plans | At December 31, 2017 and 2016, the benefit obligation, fair value of plan assets and funded status of our defined benefit pension plans were (in millions):
| 2017 |  | 2016
Benefit Obligation: |  |  |
January 1 | $ | 251.1 |  |  | $ | 234.8 |
Service cost | 10.1 |  |  | 7.8 |
Interest cost | 7.9 |  |  | 7.8 |
Amendments, curtailments and settlements | 0.3 |  |  | — |
Actuarial losses | 6.8 |  |  | 13.3 |
Benefits paid | (9.1 | ) |  | (9.4 | )
Foreign currency translation | 9.9 |  |  | (3.2 | )
December 31 | $ | 277.0 |  |  | $ | 251.1 |
Fair Value of Plan Assets: |  |  |
January 1 | $ | 68.6 |  |  | $ | 68.9 |
Actual return on plan assets | 6.3 |  |  | 4.9 |
Employer contributions | 8.3 |  |  | 6.6 |
Benefits paid | (9.1 | ) |  | (9.4 | )
Foreign currency translation and other | 6.2 |  |  | (2.4 | )
December 31 | $ | 80.3 |  |  | $ | 68.6 |
Funded Status December 31 | $ | (196.7 | ) |  | $ | (182.5 | )
Amounts Recorded in Balance Sheet, as Classified | At December 31, 2017 and 2016, the funded status was classified as follows (in millions):
| 2017 |  | 2016
Other assets | $ | 6.0 |  |  | $ | 4.2 |
Other current liabilities | (5.1 | ) |  | (5.1 | )
Long-term liabilities | (197.6 | ) |  | (181.6 | )
| $ | (196.7 | ) |  | $ | (182.5 | )
Plans with Benefit Obligations in Excess of Plan Assets | At December 31, 2017 and 2016, plans with benefit obligations in excess of plan assets were (in millions):
| 2017 |  | 2016
Benefit obligation | $ | 253.8 |  |  | $ | 241.3 |
Plan assets | 51.1 |  |  | 54.6 |
| $ | 202.7 |  |  | $ | 186.7 |
Weighted Average Assumptions Used to Determine Benefit Obligation | The weighted average assumptions used to determine the benefit obligation at December 31, 2017 and 2016, were:
| 2017 |  | 2016
Discount rate | 3.1 | % |  | 3.5 | %
Compensation increases | 2.0 | % |  | 2.0 | %
Estimated Future Benefit Payments | At December 31, 2017, the estimated benefits expected to be paid over the next 10 years are (in millions):
2018 | $ | 9.7 |
2019 | 10.8 |
2020 | 12.3 |
2021 | 16.1 |
2022 | 16.8 |
2023 - 2027 | 99.6 |
Fair Value of Plan Assets | The fair value of plan assets at December 31, 2017 and 2016 was (in millions):
2017 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash | $ | 1.0 |  |  |  |  |  |  | $ | 1.0 |
Mutual funds | 41.5 |  |  |  |  |  |  | 41.5 |
Unit trusts | 28.2 |  |  |  |  |  |  | 28.2 |
Insurance contracts |  |  |  |  | $ | 8.6 |  |  | 8.6 |
Other |  |  | $ | 1.0 |  |  |  |  | 1.0 |
| $ | 70.7 |  |  | $ | 1.0 |  |  | $ | 8.6 |  |  | $ | 80.3 |
2016 |  |  |  |  |  |  |
Cash | $ | 1.6 |  |  |  |  |  |  | $ | 1.6 |
Mutual funds | 39.0 |  |  |  |  |  |  | 39.0 |
Unit trusts | 23.5 |  |  |  |  |  |  | 23.5 |
Insurance contracts |  |  |  |  | $ | 4.3 |  |  | 4.3 |
Other |  |  | $ | 0.2 |  |  |  |  | 0.2 |
| $ | 64.1 |  |  | $ | 0.2 |  |  | $ | 4.3 |  |  | $ | 68.6 |
Changes in Fair Value of Plan Assets Measured Using Level 3 Inputs | Changes in the fair value of plan assets measured using Level 3 inputs at December 31, 2017 and 2016 were (in millions):
| 2017 |  | 2016
January 1 | $ | 4.3 |  |  | $ | 4.2 |
Actual return on assets | 0.2 |  |  | 0.2 |
Purchases, sales and settlements, net | 4.1 |  |  | (0.1 | )
December 31 | $ | 8.6 |  |  | $ | 4.3 |
Weighted Average Plan Asset Allocations | The weighted average asset allocations at December 31, 2017 and 2016 were:
| 2017 |  | 2016
| Target Allocation |  | Actual Allocation |  | Actual Allocation
Cash | 4 | % |  | 1 | % |  | 3 | %
Mutual funds | 48 | % |  | 52 | % |  | 57 | %
Unit trusts | 34 | % |  | 35 | % |  | 34 | %
Insurance contracts | 11 | % |  | 11 | % |  | 6 | %
Other | 3 | % |  | 1 | % |  | — | %
| 100 | % |  | 100 | % |  | 100 | %
Postemployment Arrangements [Member] |
Components of Net Periodic Benefit Expense | The components of net periodic benefit expense for the three years ended December 31, 2017 were (in millions):
| 2017 |  | 2016 |  | 2015
Service cost | $ | 4.4 |  |  | $ | 3.9 |  |  | $ | 4.8 |
Interest cost | 3.7 |  |  | 3.5 |  |  | 4.3 |
Amortization of prior service cost | 3.5 |  |  | 3.1 |  |  | 3.2 |
Amortization of actuarial losses | 1.0 |  |  | 1.1 |  |  | 1.6 |
| $ | 12.6 |  |  | $ | 11.6 |  |  | $ | 13.9 |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Expense | The weighted average assumptions used to determine net periodic benefit expense for the three years ended December 31, 2017 were:
| 2017 |  | 2016 |  | 2015
Discount rate | 3.9 | % |  | 4.1 | % |  | 3.8 | %
Compensation increases | 3.5 | % |  | 3.5 | % |  | 3.5 | %
Benefit Obligation | At December 31, 2017 and 2016, the benefit obligation was (in millions):
| 2017 |  | 2016
January 1 | $ | 120.3 |  |  | $ | 115.9 |
Service cost | 4.4 |  |  | 3.9 |
Interest cost | 3.7 |  |  | 3.5 |
Amendments | — |  |  | 5.6 |
Actuarial (gain) loss | 8.1 |  |  | 0.6 |
Benefits paid | (8.8 | ) |  | (9.2 | )
December 31 | $ | 127.7 |  |  | $ | 120.3 |
Amounts Recorded in Balance Sheet, as Classified | At December 31, 2017 and 2016, the liability was classified as follows (in millions):
| 2017 |  | 2016
Other current liabilities | $ | 9.3 |  |  | $ | 8.1 |
Long-term liabilities | 118.4 |  |  | 112.2 |
| $ | 127.7 |  |  | $ | 120.3 |
Weighted Average Assumptions Used to Determine Benefit Obligation | The weighted average assumptions used to determine the benefit obligation at December 31, 2017 and 2016 were:
| 2017 |  | 2016
Discount rate | 3.4 | % |  | 3.9 | %
Compensation increases | 3.5 | % |  | 3.5 | %
Estimated Future Benefit Payments | At December 31, 2017, the estimated benefits expected to be paid over the next 10 years are (in millions):
2018 | $ | 9.3 |
2019 | 7.4 |
2020 | 6.6 |
2021 | 6.1 |
2022 | 6.5 |
2023 - 2027 | 33.2 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References No definition available. + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on 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 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the aggregate benefit obligation and aggregate fair value of plan assets for pension plans and/or other employee benefit plans with benefit obligations in excess of plan assets as of the measurement date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: 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=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -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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