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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] | The following tables provide the changes in the benefit obligation and fair value of plan assets and statements of the funded status of the plans.
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
| (in millions of dollars)
Change in Benefit Obligation |  |  |  |  |  |  |  |  |  |  |
Benefit Obligation at Beginning of Year | $ | 1,718.7 |  |  | $ | 1,967.9 |  |  | $ | 208.7 |  |  | $ | 197.4 |  |  | $ | 165.3 |  |  | $ | 198.8 |
Service Cost | 3.7 |  |  | 59.4 |  |  | 2.3 |  |  | 4.3 |  |  | 0.3 |  |  | 0.7 |
Interest Cost | 89.9 |  |  | 86.3 |  |  | 9.1 |  |  | 8.6 |  |  | 7.9 |  |  | 8.0 |
Plan Participant Contributions | — |  |  | — |  |  | — |  |  | — |  |  | 4.1 |  |  | 3.9 |
Actuarial (Gain) Loss | 343.5 |  |  | (225.9 | ) |  | 25.2 |  |  | 2.6 |  |  | 12.9 |  |  | (30.2 | )
Benefits and Expenses Paid | (48.7 | ) |  | (42.2 | ) |  | (4.3 | ) |  | (4.1 | ) |  | (16.6 | ) |  | (15.9 | )
Curtailment | — |  |  | (126.8 | ) |  | — |  |  | (3.7 | ) |  | — |  |  | — |
Settlements | (214.5 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Change in Foreign Exchange Rates | — |  |  | — |  |  | (14.1 | ) |  | 3.6 |  |  | — |  |  | — |
Benefit Obligation at End of Year | $ | 1,892.6 |  |  | $ | 1,718.7 |  |  | $ | 226.9 |  |  | $ | 208.7 |  |  | $ | 173.9 |  |  | $ | 165.3 |
Accumulated Benefit Obligation at December 31 | $ | 1,892.6 |  |  | $ | 1,718.7 |  |  | $ | 215.3 |  |  | $ | 197.7 |  |  | N/A |  | N/A
Change in Fair Value of Plan Assets |  |  |  |  |  |  |  |  |  |  |
Fair Value of Plan Assets at Beginning of Year | $ | 1,590.7 |  |  | $ | 1,353.6 |  |  | $ | 225.7 |  |  | $ | 205.6 |  |  | $ | 11.4 |  |  | $ | 11.5 |
Actual Return on Plan Assets | 140.9 |  |  | 224.6 |  |  | 37.8 |  |  | 15.6 |  |  | 0.4 |  |  | 0.2 |
Employer Contributions | 5.3 |  |  | 54.7 |  |  | 2.3 |  |  | 4.0 |  |  | 12.0 |  |  | 11.7 |
Plan Participant Contributions | — |  |  | — |  |  | — |  |  | — |  |  | 4.1 |  |  | 3.9 |
Benefits and Expenses Paid | (48.7 | ) |  | (42.2 | ) |  | (4.3 | ) |  | (4.1 | ) |  | (16.6 | ) |  | (15.9 | )
Settlements | (214.5 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Change in Foreign Exchange Rates | — |  |  | — |  |  | (15.2 | ) |  | 4.6 |  |  | — |  |  | — |
Fair Value of Plan Assets at End of Year | $ | 1,473.7 |  |  | $ | 1,590.7 |  |  | $ | 246.3 |  |  | $ | 225.7 |  |  | $ | 11.3 |  |  | $ | 11.4 |
Underfunded (Overfunded) Status | $ | 418.9 |  |  | $ | 128.0 |  |  | $ | (19.4 | ) |  | $ | (17.0 | ) |  | $ | 162.6 |  |  | $ | 153.9 |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | The amounts recognized in our consolidated balance sheets for our pension and OPEB plans at December 31, 2014 and 2013 are as follows.
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
| (in millions of dollars)
Current Liability | $ | 5.4 |  |  | $ | 5.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 13.7 |  |  | $ | 14.6 |
Noncurrent Liability | 413.5 |  |  | 136.2 |  |  | — |  |  | — |  |  | 148.9 |  |  | 139.3 |
Noncurrent Asset | — |  |  | (13.4 | ) |  | (19.4 | ) |  | (17.0 | ) |  | — |  |  | — |
Underfunded (Overfunded) Status | $ | 418.9 |  |  | $ | 128.0 |  |  | $ | (19.4 | ) |  | $ | (17.0 | ) |  | $ | 162.6 |  |  | $ | 153.9 |
Unrecognized Pension and Postretirement Benefit Costs |  |  |  |  |  |  |  |  |  |  |
Net Actuarial Gain (Loss) | $ | (593.0 | ) |  | $ | (342.1 | ) |  | $ | (35.4 | ) |  | $ | (36.9 | ) |  | $ | (2.6 | ) |  | $ | 10.3 |
Prior Service Credit | — |  |  | — |  |  | — |  |  | — |  |  | 0.7 |  |  | 2.4 |
| (593.0 | ) |  | (342.1 | ) |  | (35.4 | ) |  | (36.9 | ) |  | (1.9 | ) |  | 12.7 |
Deferred Income Tax Asset | 207.5 |  |  | 119.7 |  |  | 10.4 |  |  | 10.9 |  |  | 10.9 |  |  | 5.8 |
Total Included in Accumulated Other Comprehensive Income (Loss) | $ | (385.5 | ) |  | $ | (222.4 | ) |  | $ | (25.0 | ) |  | $ | (26.0 | ) |  | $ | 9.0 |  |  | $ | 18.5 |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | The following table provides the changes recognized in other comprehensive income for the years ended December 31, 2014 and 2013.
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
| (in millions of dollars)
Accumulated Other Comprehensive Income (Loss) at Beginning of Year | $ | (222.4 | ) |  | $ | (549.9 | ) |  | $ | (26.0 | ) |  | $ | (27.0 | ) |  | $ | 18.5 |  |  | $ | 2.4 |
Net Actuarial Gain (Loss) |  |  |  |  |  |  |  |  |  |  |
Amortization | 5.2 |  |  | 31.7 |  |  | 0.4 |  |  | 1.2 |  |  | — |  |  | — |
Curtailment | — |  |  | 126.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements | 64.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
All Other Changes | (320.5 | ) |  | 344.8 |  |  | 1.1 |  |  | (0.2 | ) |  | (12.9 | ) |  | 29.6 |
Prior Service Credit (Cost) |  |  |  |  |  |  |  |  |  |  |
Amortization | — |  |  | (0.1 | ) |  | — |  |  | — |  |  | (1.7 | ) |  | (4.9 | )
Curtailment | — |  |  | 0.7 |  |  | — |  |  | (3.7 | ) |  | — |  |  | — |
Plan Amendment | — |  |  | — |  |  | — |  |  | 3.9 |  |  | — |  |  | — |
Change in Deferred Income Tax Asset | 87.8 |  |  | (176.4 | ) |  | (0.5 | ) |  | (0.2 | ) |  | 5.1 |  |  | (8.6 | )
Accumulated Other Comprehensive Income (Loss) at End of Year | $ | (385.5 | ) |  | $ | (222.4 | ) |  | $ | (25.0 | ) |  | $ | (26.0 | ) |  | $ | 9.0 |  |  | $ | 18.5 |
Fair Values by Fair Value Hierarchy Input Level | Fair value measurements by input level for financial instruments carried at fair value are as follows:
| December 31, 2014
| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Assets |  |  |  |  |  |  |
Fixed Maturity Securities |  |  |  |  |  |  |
United States Government and Government Agencies and Authorities | $ | 297.5 |  |  | $ | 941.0 |  |  | $ | — |  |  | $ | 1,238.5 |
States, Municipalities, and Political Subdivisions | — |  |  | 1,981.4 |  |  | 140.1 |  |  | 2,121.5 |
Foreign Governments | — |  |  | 1,238.1 |  |  | 69.3 |  |  | 1,307.4 |
Public Utilities | 106.2 |  |  | 8,129.4 |  |  | 315.0 |  |  | 8,550.6 |
Mortgage/Asset-Backed Securities | — |  |  | 2,431.8 |  |  | — |  |  | 2,431.8 |
All Other Corporate Bonds | 2,556.6 |  |  | 25,383.3 |  |  | 1,425.3 |  |  | 29,365.2 |
Redeemable Preferred Stocks | — |  |  | 25.0 |  |  | 24.9 |  |  | 49.9 |
Total Fixed Maturity Securities | 2,960.3 |  |  | 40,130.0 |  |  | 1,974.6 |  |  | 45,064.9 |
Other Long-term Investments |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |
Interest Rate Swaps | — |  |  | 5.7 |  |  | — |  |  | 5.7 |
Foreign Exchange Contracts | — |  |  | 22.3 |  |  | — |  |  | 22.3 |
Total Derivatives | — |  |  | 28.0 |  |  | — |  |  | 28.0 |
Equity Securities | — |  |  | 11.1 |  |  | 1.4 |  |  | 12.5 |
Liabilities |  |  |  |  |  |  |
Other Liabilities |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |
Interest Rate Swaps | $ | — |  |  | $ | 20.8 |  |  | $ | — |  |  | $ | 20.8 |
Foreign Exchange Contracts | — |  |  | 70.9 |  |  | — |  |  | 70.9 |
Credit Default Swaps | — |  |  | 1.2 |  |  | — |  |  | 1.2 |
Embedded Derivative in Modified Coinsurance Arrangement | — |  |  | — |  |  | 49.9 |  |  | 49.9 |
Total Derivatives | — |  |  | 92.9 |  |  | 49.9 |  |  | 142.8 |
| December 31, 2013
| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Assets |  |  |  |  |  |  |
Fixed Maturity Securities |  |  |  |  |  |  |
United States Government and Government Agencies and Authorities | $ | 144.5 |  |  | $ | 1,051.6 |  |  | $ | — |  |  | $ | 1,196.1 |
States, Municipalities, and Political Subdivisions | — |  |  | 1,608.1 |  |  | 175.1 |  |  | 1,783.2 |
Foreign Governments | — |  |  | 1,294.7 |  |  | 78.5 |  |  | 1,373.2 |
Public Utilities | 246.0 |  |  | 7,611.9 |  |  | 139.3 |  |  | 7,997.2 |
Mortgage/Asset-Backed Securities | — |  |  | 2,038.8 |  |  | 0.5 |  |  | 2,039.3 |
All Other Corporate Bonds | 2,132.8 |  |  | 23,861.6 |  |  | 1,923.3 |  |  | 27,917.7 |
Redeemable Preferred Stocks | — |  |  | 13.9 |  |  | 23.8 |  |  | 37.7 |
Total Fixed Maturity Securities | 2,523.3 |  |  | 37,480.6 |  |  | 2,340.5 |  |  | 42,344.4 |
Other Long-term Investments |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |
Interest Rate Swaps | — |  |  | 9.2 |  |  | — |  |  | 9.2 |
Foreign Exchange Contracts | — |  |  | 1.6 |  |  | — |  |  | 1.6 |
Total Derivatives | — |  |  | 10.8 |  |  | — |  |  | 10.8 |
Equity Securities | — |  |  | 11.8 |  |  | 4.6 |  |  | 16.4 |
Liabilities |  |  |  |  |  |  |
Other Liabilities |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |
Interest Rate Swaps | $ | — |  |  | $ | 35.0 |  |  | $ | — |  |  | $ | 35.0 |
Foreign Exchange Contracts | — |  |  | 98.7 |  |  | — |  |  | 98.7 |
Credit Default Swaps | — |  |  | 1.9 |  |  | — |  |  | 1.9 |
Embedded Derivative in Modified Coinsurance Arrangement | — |  |  | — |  |  | 53.2 |  |  | 53.2 |
Total Derivatives | — |  |  | 135.6 |  |  | 53.2 |  |  | 188.8 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:
| Year Ended December 31, 2014
|  |  | Total Realized and Unrealized Investment Gains (Losses) Included in |  |  |  |  |  |  |  |  |  |
| Beginning of Year |  | Earnings |  | Other Comprehensive Income or Loss |  | Purchases |  | Sales |  | Level 3 Transfers |  | End of Year
| Into |  | Out of |
| (in millions of dollars)
Fixed Maturity Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States, Municipalities, and Political Subdivisions | $ | 175.1 |  |  | $ | — |  |  | $ | 21.0 |  |  | $ | — |  |  | $ | (1.4 | ) |  | $ | — |  |  | $ | (54.6 | ) |  | $ | 140.1 |
Foreign Governments | 78.5 |  |  | 1.1 |  |  | 0.8 |  |  | — |  |  | (11.1 | ) |  | — |  |  | — |  |  | 69.3 |
Public Utilities | 139.3 |  |  | — |  |  | 6.9 |  |  | — |  |  | (0.8 | ) |  | 199.9 |  |  | (30.3 | ) |  | 315.0 |
Mortgage/Asset-Backed Securities | 0.5 |  |  | (0.2 | ) |  | 0.3 |  |  | — |  |  | (0.6 | ) |  | — |  |  | — |  |  | — |
All Other Corporate Bonds | 1,923.3 |  |  | 0.7 |  |  | 44.8 |  |  | 91.1 |  |  | (147.7 | ) |  | 626.9 |  |  | (1,113.8 | ) |  | 1,425.3 |
Redeemable Preferred Stocks | 23.8 |  |  | — |  |  | 1.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 24.9 |
Total Fixed Maturity Securities | 2,340.5 |  |  | 1.6 |  |  | 74.9 |  |  | 91.1 |  |  | (161.6 | ) |  | 826.8 |  |  | (1,198.7 | ) |  | 1,974.6 |
Equity Securities | 4.6 |  |  | 10.5 |  |  | (0.2 | ) |  | — |  |  | (13.5 | ) |  | — |  |  | — |  |  | 1.4 |
Embedded Derivative in Modified Coinsurance Arrangement | (53.2 | ) |  | 3.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (49.9 | )
| Year Ended December 31, 2013
|  |  | Total Realized and Unrealized Investment Gains (Losses) Included in |  |  |  |  |  |  |  |  |  |
| Beginning of Year |  | Earnings |  | Other Comprehensive Income or Loss |  | Purchases |  | Sales |  | Level 3 Transfers |  | End of Year
| Into |  | Out of |
| (in millions of dollars)
Fixed Maturity Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States, Municipalities, and Political Subdivisions | $ | 128.7 |  |  | $ | — |  |  | $ | (13.1 | ) |  | $ | — |  |  | $ | (1.0 | ) |  | $ | 60.5 |  |  | $ | — |  |  | $ | 175.1 |
Foreign Governments | 82.1 |  |  | — |  |  | (3.6 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | 78.5 |
Public Utilities | 226.4 |  |  | — |  |  | (1.1 | ) |  | — |  |  | (3.1 | ) |  | 101.9 |  |  | (184.8 | ) |  | 139.3 |
Mortgage/Asset-Backed Securities | 0.5 |  |  | — |  |  | 0.1 |  |  | — |  |  | (0.1 | ) |  | — |  |  | — |  |  | 0.5 |
All Other Corporate Bonds | 1,525.8 |  |  | 1.1 |  |  | (156.8 | ) |  | 186.7 |  |  | (122.0 | ) |  | 1,511.9 |  |  | (1,023.4 | ) |  | 1,923.3 |
Redeemable Preferred Stocks | 24.8 |  |  | — |  |  | (1.0 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | 23.8 |
Total Fixed Maturity Securities | 1,988.3 |  |  | 1.1 |  |  | (175.5 | ) |  | 186.7 |  |  | (126.2 | ) |  | 1,674.3 |  |  | (1,208.2 | ) |  | 2,340.5 |
Equity Securities | 4.3 |  |  | — |  |  | 0.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4.6 |
Embedded Derivative in Modified Coinsurance Arrangement | (83.9 | ) |  | 30.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (53.2 | )
Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation. Gains for the years ended December 31, 2014 and 2013 which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at each year end were $3.3 million and $30.7 million, respectively. These amounts relate entirely to the changes in fair value of an embedded derivative in a modified coinsurance arrangement which are reported as realized investment gains and losses.
Schedule of Assumptions Used [Table Text Block] | We use a December 31 measurement date for each of our plans. The weighted average assumptions used in the measurement of our benefit obligations as of December 31 and our net periodic benefit costs for the years ended December 31 are as follows:
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Benefit Obligations |  |  |  |  |  |  |  |  |  |  |
Discount Rate | 4.40 | % |  | 5.30 | % |  | 3.60 | % |  | 4.40 | % |  | 4.30 | % |  | 5.00 | %
Rate of Compensation Increase | N/A |  |  | 4.00 | % |  | 3.60 | % |  | 3.90 | % |  | N/A |  |  | N/A |
Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |
Discount Rate | 5.30 | % |  | 4.50% / 5.00%* |  |  | 4.40 | % |  | 4.50% / 4.60%** |  |  | 5.00 | % |  | 4.20 | %
Expected Return on Plan Assets | 7.50 | % |  | 7.50 | % |  | 6.10 | % |  | 6.20% / 6.35%** |  |  | 5.75 | % |  | 5.75 | %
Rate of Compensation Increase | N/A |  |  | 4.00 | % |  | 3.90 | % |  | 3.75 | % |  | N/A |  |  | N/A |
*In conjunction with the remeasurement due to the 2013 plan amendment, a discount rate of 4.50% was used for the period January 1, 2013 through the date of remeasurement, and a discount rate of 5.00% was used for the period subsequent to the date of remeasurement through December 31, 2013. **In conjunction with the remeasurement due to the 2013 plan amendment, a discount rate of 4.50% and expected return on plan assets of 6.20% were used for the period January 1, 2013 through the date of remeasurement, and a discount rate of 4.60% and expected return on plan assets of 6.35% were used for the period subsequent to the date of remeasurement through December 31, 2013.
Schedule of Net Benefit Costs [Table Text Block] | Net Periodic Benefit Cost The following table provides the components of the net periodic benefit cost for the plans described above for the years ended December 31.
| Pension Benefits |  |  |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2014 |  | 2013 |  | 2012 |  | 2014 |  | 2013 |  | 2012 |  | 2014 |  | 2013 |  | 2012
| (in millions of dollars)
Service Cost | $ | 3.7 |  |  | $ | 59.4 |  |  | $ | 48.8 |  |  | $ | 2.3 |  |  | $ | 4.3 |  |  | $ | 4.2 |  |  | $ | 0.3 |  |  | $ | 0.7 |  |  | $ | 1.6 |
Interest Cost | 89.9 |  |  | 86.3 |  |  | 84.4 |  |  | 9.1 |  |  | 8.6 |  |  | 8.5 |  |  | 7.9 |  |  | 8.0 |  |  | 9.6 |
Expected Return on Plan Assets | (117.8 | ) |  | (105.5 | ) |  | (88.8 | ) |  | (13.7 | ) |  | (12.5 | ) |  | (11.1 | ) |  | (0.7 | ) |  | (0.6 | ) |  | (0.7 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Actuarial Loss | 5.2 |  |  | 31.7 |  |  | 45.9 |  |  | 0.4 |  |  | 1.2 |  |  | 0.5 |  |  | — |  |  | — |  |  | — |
Prior Service Credit | — |  |  | (0.1 | ) |  | (0.4 | ) |  | — |  |  | — |  |  | — |  |  | (1.7 | ) |  | (4.9 | ) |  | (2.6 | )
Curtailment | — |  |  | 0.7 |  |  | — |  |  | — |  |  | (3.7 | ) |  | — |  |  | — |  |  | — |  |  | — |
Settlement | 64.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Net Periodic Benefit Cost | $ | 45.4 |  |  | $ | 72.5 |  |  | $ | 89.9 |  |  | $ | (1.9 | ) |  | $ | (2.1 | ) |  | $ | 2.1 |  |  | $ | 5.8 |  |  | $ | 3.2 |  |  | $ | 7.9 |
Schedule of Expected Benefit Payments [Table Text Block] | The following table provides expected benefit payments, which reflect expected future service, as appropriate.
| Pension Benefits |  |  |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| (in millions of dollars)
Year |  |  |  |  | Gross |  | Subsidy Payments |  | Net
2015 | $ | 49.8 |  |  | $ | 5.5 |  |  | $ | 15.9 |  |  | $ | 1.9 |  |  | $ | 14.0 |
2016 | 54.1 |  |  | 6.0 |  |  | 15.6 |  |  | 2.1 |  |  | 13.5 |
2017 | 58.2 |  |  | 6.2 |  |  | 15.3 |  |  | 2.3 |  |  | 13.0 |
2018 | 62.6 |  |  | 6.4 |  |  | 14.9 |  |  | 2.4 |  |  | 12.5 |
2019 | 67.0 |  |  | 7.0 |  |  | 14.6 |  |  | 2.7 |  |  | 11.9 |
2020-2024 | 409.6 |  |  | 39.4 |  |  | 65.4 |  |  | 15.5 |  |  | 49.9 |
Pension Benefits, U.S. Plans |
Defined Benefit Plans and Other Postretirement Benefit Plans |
Fair Values by Fair Value Hierarchy Input Level | The categorization of fair value measurements by input level for the invested assets in our U.S. pension plans is as follows:
| December 31, 2014
| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Invested Assets |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |
U.S. Large Cap | $ | — |  |  | $ | 181.4 |  |  | $ | — |  |  | $ | 181.4 |
U.S. Mid Cap | — |  |  | 88.3 |  |  | — |  |  | 88.3 |
U.S. Small Cap | 118.7 |  |  | — |  |  | — |  |  | 118.7 |
International | 71.0 |  |  | 63.5 |  |  | — |  |  | 134.5 |
Emerging Markets | — |  |  | 40.0 |  |  | — |  |  | 40.0 |
Fixed Income Securities: |  |  |  |  |  |  |
U.S. Government and Agencies | 243.5 |  |  | 14.6 |  |  | — |  |  | 258.1 |
Corporate | 1.6 |  |  | 321.2 |  |  | — |  |  | 322.8 |
State and Municipal Securities | — |  |  | 2.9 |  |  | — |  |  | 2.9 |
Opportunistic Credits | 62.8 |  |  | 85.0 |  |  | — |  |  | 147.8 |
Alternative Investments: |  |  |  |  |  |  |
Private Equity Direct Investments | — |  |  | — |  |  | 17.2 |  |  | 17.2 |
Private Equity Funds of Funds | — |  |  | — |  |  | 34.9 |  |  | 34.9 |
Hedge Funds of Funds | — |  |  | — |  |  | 70.0 |  |  | 70.0 |
Cash Equivalents | 52.8 |  |  | — |  |  | — |  |  | 52.8 |
Total Invested Assets | $ | 550.4 |  |  | $ | 796.9 |  |  | $ | 122.1 |  |  | $ | 1,469.4 |
| December 31, 2013
| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Invested Assets |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |
U.S. Large Cap | $ | — |  |  | $ | 343.9 |  |  | $ | — |  |  | $ | 343.9 |
U.S. Mid Cap | — |  |  | 139.6 |  |  | — |  |  | 139.6 |
U.S. Small Cap | 231.9 |  |  | — |  |  | — |  |  | 231.9 |
International | 134.5 |  |  | 131.7 |  |  | — |  |  | 266.2 |
Emerging Markets | — |  |  | 76.3 |  |  | — |  |  | 76.3 |
Fixed Income Securities: |  |  |  |  |  |  |
U.S. Government and Agencies | 105.7 |  |  | 7.4 |  |  | — |  |  | 113.1 |
Corporate | 97.8 |  |  | 172.6 |  |  | — |  |  | 270.4 |
State and Municipal Securities | — |  |  | 12.9 |  |  | — |  |  | 12.9 |
Alternative Investments: |  |  |  |  |  |  |
Private Equity Direct Investments | — |  |  | — |  |  | 7.2 |  |  | 7.2 |
Private Equity Funds of Funds | — |  |  | — |  |  | 29.6 |  |  | 29.6 |
Hedge Funds of Funds | — |  |  | — |  |  | 66.9 |  |  | 66.9 |
Cash Equivalents | 28.4 |  |  | — |  |  | — |  |  | 28.4 |
Total Invested Assets | $ | 598.3 |  |  | $ | 884.4 |  |  | $ | 103.7 |  |  | $ | 1,586.4 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | Changes in our U.S. pension plans' assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2014 and 2013 are as follows:
| Year Ended December 31, 2014
| Beginning of Year |  | Actual Return on Plan Assets |  | Purchases |  | Sales |  | Level 3 Transfers |  | End of Year
|  | Held at Year End |  | Sold During the Year |  |  | Into |  | Out of |
| (in millions of dollars)
Private Equity Direct Investments | $ | 7.2 |  |  | $ | 1.7 |  |  | $ | 0.1 |  |  | $ | 9.0 |  |  | $ | (0.8 | ) |  | $ | — |  |  | $ | — |  |  | $ | 17.2 |
Private Equity Funds of Funds | 29.6 |  |  | 4.8 |  |  | 2.6 |  |  | 3.9 |  |  | (6.0 | ) |  | — |  |  | — |  |  | 34.9 |
Hedge Funds of Funds | 66.9 |  |  | 3.2 |  |  | (0.1 | ) |  | 25.9 |  |  | (25.9 | ) |  | — |  |  | — |  |  | 70.0 |
Total | $ | 103.7 |  |  | $ | 9.7 |  |  | $ | 2.6 |  |  | $ | 38.8 |  |  | $ | (32.7 | ) |  | $ | — |  |  | $ | — |  |  | $ | 122.1 |
| Year Ended December 31, 2013
| Beginning of Year |  | Actual Return on Plan Assets |  | Purchases |  | Sales |  | Level 3 Transfers |  | End of Year
|  | Held at Year End |  | Sold During the Year |  |  | Into |  | Out of |
| (in millions of dollars)
Private Equity Direct Investments | $ | — |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | 8.4 |  |  | $ | (1.5 | ) |  | $ | — |  |  | $ | — |  |  | $ | 7.2 |
Private Equity Funds of Funds | 28.7 |  |  | 0.9 |  |  | 1.1 |  |  | 2.1 |  |  | (3.2 | ) |  | — |  |  | — |  |  | 29.6 |
Hedge Funds of Funds | 56.1 |  |  | 6.3 |  |  | — |  |  | 4.9 |  |  | (0.4 | ) |  | — |  |  | — |  |  | 66.9 |
Total | $ | 84.8 |  |  | $ | 7.5 |  |  | $ | 1.1 |  |  | $ | 15.4 |  |  | $ | (5.1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 103.7 |
Pension Benefits, Non U.S. Plans |
Defined Benefit Plans and Other Postretirement Benefit Plans |
Fair Values by Fair Value Hierarchy Input Level | The categorization of fair value measurements by input level for the assets in our U.K. pension plan is as follows.
| December 31, 2014
| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Plan Assets |  |  |  |  |  |  |
Diversified Growth Assets | $ | — |  |  | $ | 167.6 |  |  | $ | — |  |  | $ | 167.6 |
Fixed Interest and Index-linked Securities | 78.0 |  |  | — |  |  | — |  |  | 78.0 |
Cash Equivalents | 0.7 |  |  | — |  |  | — |  |  | 0.7 |
Total Plan Assets | $ | 78.7 |  |  | $ | 167.6 |  |  | $ | — |  |  | $ | 246.3 |
| December 31, 2013
| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Plan Assets |  |  |  |  |  |  |
Diversified Growth Assets | $ | — |  |  | $ | 172.0 |  |  | $ | — |  |  | $ | 172.0 |
Fixed Interest and Index-linked Securities | 52.6 |  |  | 0.4 |  |  | — |  |  | 53.0 |
Cash Equivalents | 0.7 |  |  | — |  |  | — |  |  | 0.7 |
Total Plan Assets | $ | 53.3 |  |  | $ | 172.4 |  |  | $ | — |  |  | $ | 225.7 |
Other Postretirement Benefit Plans |
Defined Benefit Plans and Other Postretirement Benefit Plans |
Fair Values by Fair Value Hierarchy Input Level | The categorization of fair value measurements by input level for the assets in our OPEB plan is as follows:
| December 31, 2014
| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Assets |  |  |  |  |  |  |
Life Insurance Contracts | $ | — |  |  | $ | — |  |  | $ | 11.3 |  |  | $ | 11.3 |
| December 31, 2013
| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Assets |  |  |  |  |  |  |
Life Insurance Contracts | $ | — |  |  | $ | — |  |  | $ | 11.4 |  |  | $ | 11.4 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The fair value is represented by the actuarial present value of future cash flows of the contracts. Changes in our OPEB plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2014 and 2013 are as follows:
| Year Ended December 31, 2014
| Beginning of Year |  | Actual Return on Plan Assets |  | Contributions |  | Net Benefits and Expenses Paid |  | End of Year
| (in millions of dollars)
Life Insurance Contracts | $ | 11.4 |  |  | $ | 0.4 |  |  | $ | 16.1 |  |  | $ | (16.6 | ) |  | $ | 11.3 |
| Year Ended December 31, 2013
| Beginning of Year |  | Actual Return on Plan Assets |  | Contributions |  | Net Benefits and Expenses Paid |  | End of Year
| (in millions of dollars)
Life Insurance Contracts | $ | 11.5 |  |  | $ | 0.2 |  |  | $ | 15.6 |  |  | $ | (15.9 | ) |  | $ | 11.4 |

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