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Pension Benefits (Tables) - Pension Plans, Defined Benefit [Member] | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Changes in Fair Value of Plan Assets | Changes in Fair Value of Plan Assets and Changes in Projected Benefit Obligation for the Pension Plan for the years ended December 31, 2017 and 2016 is presented below.
DOLLARS IN MILLIONS |  | 2017 |  | 2016
Fair Value of Plan Assets at Beginning of Year |  | $ | 520.9 |  |  | $ | 507.5 |
Actual Return on Plan Assets |  | 86.4 |  |  | 29.9 |
Employer Contributions |  | — |  |  | 9.0 |
Benefits Paid |  | (27.5 | ) |  | (25.5 | )
Fair Value of Plan Assets at End of Year |  | 579.8 |  |  | 520.9 |
Projected Benefit Obligation at Beginning of Year |  | 593.6 |  |  | 597.8 |
Service Cost |  | — |  |  | 4.8 |
Interest Cost |  | 20.6 |  |  | 20.1 |
Benefits Paid |  | (27.5 | ) |  | (25.5 | )
Curtailment |  | — |  |  | (23.3 | )
Actuarial Losses |  | 50.5 |  |  | 19.7 |
Projected Benefit Obligation at End of Year |  | 637.2 |  |  | 593.6 |
Funded Status—Plan Assets in Deficit of Projected Benefit Obligation |  | $ | (57.4 | ) |  | $ | (72.7 | )
Unamortized Amount Reported in AOCI at End of Year: |  |  |  |
Accumulated Actuarial Loss |  | $ | (137.2 | ) |  | $ | (144.7 | )
Prior Service Credit |  | — |  |  | — |
Unamortized Amount Reported in AOCI at End of Year |  | $ | (137.2 | ) |  | $ | (144.7 | )
Accumulated Benefit Obligation at End of Year |  | $ | 637.0 |  |  | $ | 593.5 |
Schedule of Assumptions Used | used to develop the components of Pension Expense for the Pension Plan for the periods presented below were:
|  | Year Ended |  |  |  |  |  | Year Ended
|  | December 31, 2017 |  | 5/13/16 to 12/31/16 |  | 1/1/16 to 5/12/16 |  | December 31, 2015
Weighted-average Discount Rate |  | 4.19 | % |  | 3.94 | % |  | 4.47 | % |  | 4.10 | %
Service Cost Discount Rate |  | 4.15 |  |  | 4.22 |  |  | 4.78 |  |  | — |
Interest Cost Discount Rate |  | 3.52 |  |  | 3.18 |  |  | 3.69 |  |  | — |
Rate of Increase in Future Compensation Levels |  | 2.56 |  |  | 3.15 |  |  | 3.15 |  |  | 3.31 |
Expected Long Term Rate of Return on Plan Assets |  | 5.80 |  |  | 6.25 |  |  | 6.25 |  |  | 6.75 |
The weighted-average discount rate and rate of increase in future compensation levels used to estimate the components of the Projected Benefit Obligation for the Pension Plan at December 31, 2017 and 2016 were:
|  | 2017 |  | 2016
Discount Rate |  | 3.63 | % |  | 4.18 | %
Rate of Increase in Future Compensation Levels |  | 3.40 |  |  | 2.56 |
Schedule of Allocation of Plan Assets | Weighted-average asset allocations for the Pension Plan at December 31, 2017 and 2016 by asset category were:
ASSET CATEGORY |  | 2017 |  | 2016
Cash and Short-term Investments |  | 2 | % |  | 2 | %
Corporate Bonds and Notes |  | 31 |  |  | 31 |
Common and Preferred Stocks |  | 50 |  |  | 48 |
Exchange Traded Funds |  | 1 |  |  | 1 |
Other Assets |  | 16 |  |  | 18 |
Total |  | 100 | % |  | 100 | %
Fair Value, Measurement Inputs, Disclosure | Fair value measurements for the Pension Plan’s assets at December 31, 2016 are summarized below.
DOLLARS IN MILLIONS |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Measured at Net Asset Value |  | Fair Value
Fixed Maturities: |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 21.2 |  |  | $ | 8.6 |  |  | $ | — |  |  | — |  |  | $ | 29.8 |
States and Political Subdivisions |  | — |  |  | 3.1 |  |  | — |  |  | — |  |  | 3.1 |
Corporate Bonds and Notes |  | — |  |  | 126.4 |  |  | — |  |  | — |  |  | 126.4 |
Equity Securities: |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | 6.2 |  |  | — |  |  | — |  |  | 6.2 |
Common Stocks: |  |  |  |  |  |  |  |  |  |
Manufacturing |  | 77.5 |  |  | 16.0 |  |  | — |  |  | — |  |  | 93.5 |
Other Industries |  | 88.1 |  |  | — |  |  | — |  |  | — |  |  | 88.1 |
Other Equity Interests: |  |  |  |  |  |  |  |  |  |
Collective Investment Funds |  | — |  |  | — |  |  | — |  |  | 60.7 |  |  | 60.7 |
Exchange Traded Funds |  | 6.0 |  |  | — |  |  | — |  |  | — |  |  | 6.0 |
Limited Liability Companies and Limited Partnerships |  | — |  |  | — |  |  | — |  |  | 93.5 |  |  | 93.5 |
Short-term Investments |  | 11.8 |  |  | — |  |  | — |  |  | — |  |  | 11.8 |
Receivables and Other |  | 1.4 |  |  | — |  |  | 0.4 |  |  | — |  |  | 1.8 |
Total |  | $ | 206.0 |  |  | $ | 160.3 |  |  | $ | 0.4 |  |  | $ | 154.2 |  |  | $ | 520.9 |
Fair value measurements for the Pension Plan’s assets at December 31, 2017 are summarized below.
DOLLARS IN MILLIONS |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Measured at Net Asset Value |  | Fair Value
Fixed Maturities: |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 56.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 56.7 |
States and Political Subdivisions |  | — |  |  | 2.2 |  |  | — |  |  | — |  |  | 2.2 |
Corporate Bonds and Notes |  | — |  |  | 122.0 |  |  | — |  |  | — |  |  | 122.0 |
Equity Securities: |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | 4.9 |  |  | — |  |  | — |  |  | 4.9 |
Common Stocks: |  |  |  |  |  |  |  |  |  |
Manufacturing |  | 86.8 |  |  | 15.3 |  |  | — |  |  | — |  |  | 102.1 |
Other Industries |  | 99.6 |  |  | 4.7 |  |  | — |  |  | — |  |  | 104.3 |
Other Equity Interests: |  |  |  |  |  |  |  |  |  |
Collective Investment Funds |  | — |  |  | — |  |  | — |  |  | 79.2 |  |  | 79.2 |
Exchange Traded Funds |  | 5.1 |  |  | — |  |  | — |  |  | — |  |  | 5.1 |
Limited Liability Companies and Limited Partnerships |  | — |  |  | — |  |  | — |  |  | 95.9 |  |  | 95.9 |
Short-term Investments |  | 9.0 |  |  | — |  |  | — |  |  | — |  |  | 9.0 |
Receivables and Other |  | (1.9 | ) |  | — |  |  | 0.3 |  |  | — |  |  | (1.6 | )
Total |  | $ | 255.3 |  |  | $ | 149.1 |  |  | $ | 0.3 |  |  | $ | 175.1 |  |  | $ | 579.8 |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) | The components of Comprehensive Pension Expense (Income) for the Pension Plan for the years ended December 31, 2017, 2016 and 2015 were:
DOLLARS IN MILLIONS |  | 2017 |  | 2016 |  | 2015
Service Cost Earned During the Year |  | $ | — |  |  | $ | 4.8 |  |  | $ | 10.5 |
Interest Cost on Projected Benefit Obligation |  | 20.6 |  |  | 20.1 |  |  | 25.7 |
Expected Return on Plan Assets |  | (30.9 | ) |  | (32.7 | ) |  | (35.0 | )
Amortization of Actuarial Loss |  | 2.6 |  |  | 6.6 |  |  | 24.4 |
Curtailment Gain |  | — |  |  | (0.3 | ) |  | — |
Pension Expense (Income) Recognized in Consolidated Statements of Income |  | (7.7 | ) |  | (1.5 | ) |  | 25.6 |
Unrecognized Pension Gain Arising During the Year |  | (4.9 | ) |  | (0.7 | ) |  | (1.9 | )
Amortization of Accumulated Unrecognized Pension Loss |  | (2.6 | ) |  | (6.3 | ) |  | (24.4 | )
Comprehensive Pension Expense (Income) |  | $ | (15.2 | ) |  | $ | (8.5 | ) |  | $ | (0.7 | )
Schedule of Expected Benefit Payments | The following benefit payments (net of participant contributions), which consider expected future service of certain participants that remain eligible for a benefit accrual, as appropriate, are expected to be paid from the Pension Plan:
DOLLARS IN MILLIONS |  | Years Ending December 31,
2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023-2027
Estimated Pension Benefit Payments |  | $ | 28.5 |  |  | $ | 29.8 |  |  | $ | 30.9 |  |  | $ | 32.0 |  |  | $ | 33.0 |  |  | $ | 174.0 |
Fair Value, Inputs, Level 3 [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Changes in Fair Value of Plan Assets | Additional information pertaining to the changes in the fair value of the Pension Plan’s assets classified as Level 3 in the two preceding tables for the years ended December 31, 2017 and 2016 is presented below.
DOLLARS IN MILLIONS |  | 2017 |  | 2016
Balance at Beginning of Year |  | $ | 0.4 |  |  | $ | 0.4 |
Return on Plan Assets Held |  | — |  |  | — |
Purchases, Sales and Settlements, Net |  | (0.1 | ) |  | — |
Transfers out of Level 3 |  | — |  |  | — |
Balance at End of Year |  | $ | 0.3 |  |  | $ | 0.4 |

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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