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Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Net Periodic Pension Cost | The following table provides detail of Net periodic pension cost (benefit) for these four plans.
| Year Ended December 31,
($ in millions) | 2016 | 2015 | 2014
Employer service cost - benefits earned during the period | $ | 2.0 |  | 4.7 |  | 3.7 |
Interest cost on projected benefit obligation | 12.3 |  | 14.5 |  | 16.1 |
Expected return on plan assets | (19.5 | ) | (20.9 | ) | (24.5 | )
Net amortization of deferrals | 0.7 |  | 4.3 |  | 1.0 |
Curtailment gain | — |  | (0.4 | ) | — |
Recognized actuarial loss | 0.2 |  | 0.2 |  | 0.2 |
Net periodic pension cost (benefit) | $ | (4.3 | ) | 2.4 |  | (3.5 | )
Schedule of Net Funded Status | The following tables provide reconciliations of projected benefit obligations and plan assets (the net of which represents our funded status), as well as the funded status and accumulated benefit obligations, of our defined benefit pension plans.
($ in millions) |
Change in benefit obligation: | 2016 | 2015
Projected benefit obligation, January 1, | $ | 358.5 |  | 427.2 |
Service cost | 2.0 |  | 4.7 |
Interest cost | 12.3 |  | 14.5 |
Curtailments | — |  | (3.6 | )
Plan participants' contributions | 0.1 |  | 0.4 |
Benefits paid | (16.2 | ) | (10.1 | )
Actuarial loss (gain) | 80.7 |  | (49.6 | )
Changes in currency translation rates | (62.1 | ) | (23.0 | )
Other | (1.4 | ) | (2.0 | )
Projected benefit obligation, December 31, | $ | 373.9 |  | 358.5 |
Change in plan assets: | 2016 | 2015
Fair value of plan assets, January 1, | $ | 384.9 |  | 414.3 |
Actual return on plan assets | 52.6 |  | 16.3 |
Plan contributions | 8.4 |  | 12.2 |
Benefits paid | (16.2 | ) | (10.1 | )
Changes in currency translation rates | (63.4 | ) | (23.4 | )
Other | (1.4 | ) | (24.4 | )
Fair value of plan assets, December 31, | $ | 364.9 |  | 384.9 |
Funded status and net amount recognized | $ | (9.0 | ) | 26.4 |
Accumulated benefit obligation, December 31, | $ | 373.9 |  | 357.3 |
Schedule of Amounts Recognized in Balance Sheet | Defined benefit pension plan amounts recorded in the Consolidated Balance Sheets are presented in the below table.
| December 31,
($ in millions) | 2016 | 2015
Pension assets - included in Other long-term assets | $ | 11.2 |  | 30.5 |
Pension liabilities - included in Other long-term liabilities | (20.2 | ) | (4.1 | )
Net (liability) asset recognized | $ | (9.0 | ) | 26.4 |
Actuarial losses | $ | 90.8 |  | 59.0 |
Prior service costs | 0.6 |  | 0.6 |
Accumulated other comprehensive loss | $ | 91.2 |  | 59.6 |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | The amounts recognized in Other comprehensive income are presented in the table below.
| Year Ended December 31,
($ in millions) | 2016 | 2015 | 2014
Current year actuarial losses (gains) | $ | 44.2 |  | (25.2 | ) | 57.4 |
Reclassification adjustments included in Net periodic pension cost | (0.9 | ) | (4.1 | ) | (1.2 | )
Change in currency translation rates | (11.7 | ) | (3.5 | ) | (2.4 | )
Total | $ | 31.6 |  | (32.8 | ) | 53.8 |
Schedule of Assumptions Used | The ranges of assumptions we used in developing the projected benefit obligation as of December 31 are presented in the following table.
| 2016 |  | 2015
Discount rate used in determining present values | 2.00% | to | 2.70% |  | 2.50% | to | 3.90%
Annual increase in future compensation levels | 0.00% | to | 3.65% |  | 0.00% | to | 3.50%
The ranges of assumptions we used in determining net periodic cost (benefit) for the years ended December 31 are presented in the following table.
| 2016 |  | 2015 |  | 2014
Discount rate used in determining present values | 2.00% | to | 3.90% |  | 2.25% | to | 3.70% |  | 4.00% | to | 4.65%
Annual increase in future compensation levels | 0.00% | to | 3.50% |  | 0.00% | to | 3.50% |  | 0.00% | to | 3.85%
Expected long-term rate of return on assets | 2.00% | to | 5.90% |  | 2.70% | to | 5.80% |  | 4.10% | to | 7.00%
Schedule of Allocation of Plan Assets | Pension plan assets measured at fair value and cash are presented in the following table with the overall allocation of pension plan assets.
| December 31, 2016 |  | December 31, 2015
($ in millions) | Level 1 | Level 2 | Level 3 | Total | % |  | Level 1 | Level 2 | Level 3 | Total | %
Equity securities: |  |  |  |  |  |  |  |  |  |  |
U.K. equities | $ | 26.0 |  | 2.5 |  | — |  | 28.5 |  | 8 | % |  | $ | 46.9 |  | 15.8 |  | — |  | 62.7 |  | 16 | %
Non-U.K. equities | 89.0 |  | 14.5 |  | — |  | 103.5 |  | 28 |  |  | 104.7 |  | 22.5 |  | — |  | 127.2 |  | 33 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | 121.3 |  | 32.8 |  | — |  | 154.1 |  | 42 |  |  | 91.7 |  | 31.7 |  | — |  | 123.4 |  | 32 |
Government and other | 14.8 |  | 2.7 |  | — |  | 17.5 |  | 5 |  |  | 7.4 |  | 11.6 |  | — |  | 19.0 |  | 5 |
Cash & cash equivalents | 6.6 |  | 12.1 |  | — |  | 18.7 |  | 5 |  |  | 3.6 |  | 15.9 |  | — |  | 19.5 |  | 5 |
Other | 3.6 |  | 9.8 |  | 29.2 |  | 42.6 |  | 12 |  |  | 1.2 |  | 9.4 |  | 22.5 |  | 33.1 |  | 9 |
Total | $ | 261.3 |  | 74.4 |  | 29.2 |  | 364.9 |  | 100 | % |  | $ | 255.5 |  | 106.9 |  | 22.5 |  | 384.9 |  | 100 | %
Schedule of Expected Benefit Payments | In addition, pension benefit payments expected to be paid as of December 31, 2016, which reflect expected future service, as appropriate, are presented in the following table.
($ in millions) | Expected future minimum pension benefit payments
2017 | $ | 15.0 |
2018 | 15.4 |
2019 | 15.9 |
2020 | 16.3 |
2021 | 16.8 |
2022 to 2026 | 91.4 |
Total | $ | 170.8 |

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