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Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | $ 500.7 | $ 527.0
Balance at beginning of period | 72.5 | 62.1
Actual return on plan assets: |  |
Assets sold during the year | 0.0 | 0.4
Assets still held at year end | (1.8) | (1.3)
Net purchases, sales and settlements | 18.6 | 11.3
Defined Benefit Plan, Transfers Between Measurement Levels | (0.4) | 0.0
Balance at end of period | 88.9 | 72.5
Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 61.9 | 61.2
Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 349.9 | 393.3
Level 3 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 88.9 | 72.5
Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 410.5 | 431.5
Balance at beginning of period | 40.1 | 25.4
Actual return on plan assets: |  |
Assets sold during the year | 0.0 | 0.2
Assets still held at year end | (0.7) | (0.7)
Net purchases, sales and settlements | 18.5 | 15.2
Defined Benefit Plan, Transfers Between Measurement Levels | 0.0 | 0.0
Balance at end of period | 57.9 | 40.1
Investment funds | Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 16.8 | 18.8
Investment funds | Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 335.8 | 372.6
Investment funds | Level 3 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 57.9 | 40.1
Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 13.7 | 19.3
Insurance contracts | Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 0.0 | 0.0
Insurance contracts | Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 13.7 | 19.3
Insurance contracts | Level 3 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 0.0 | 0.0
Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 31.0 | 32.1
Balance at beginning of period | 32.1 | 36.1
Actual return on plan assets: |  |
Assets sold during the year | 0.0 | 0.2
Assets still held at year end | (1.1) | (0.3)
Net purchases, sales and settlements | 0.0 | (3.9)
Defined Benefit Plan, Transfers Between Measurement Levels | 0.0 | 0.0
Balance at end of period | 31.0 | 32.1
Limited partnerships | Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 0.0 | 0.0
Limited partnerships | Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 0.0 | 0.0
Limited partnerships | Level 3 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 31.0 | 32.1
Fixed Income Funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 22.5 | 19.0
Fixed Income Funds | Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 22.1 | 17.6
Fixed Income Funds | Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 0.4 | 1.4
Fixed Income Funds | Level 3 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 0.0 | 0.0
Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 23.0 | 25.1
Balance at beginning of period | 0.3 | 0.6
Actual return on plan assets: |  |
Assets sold during the year | 0.0 | 0.0
Assets still held at year end | 0.0 | (0.3)
Net purchases, sales and settlements | 0.1 | 0.0
Defined Benefit Plan, Transfers Between Measurement Levels | (0.4) | 0.0
Balance at end of period | 0.0 | 0.3
Other plan assets | Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 23.0 | 24.8
Other plan assets | Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 0.0 | 0.0
Other plan assets | Level 3 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | $ 0.0 | $ 0.3

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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