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Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | $ 461.1 | $ 500.7
Balance at beginning of period | 88.9 | 72.5
Assets still held at year end | (9.8) | (1.8)
Net purchases, sales and settlements | 3.2 | 18.6
Balance at end of period | 82.3 | 88.9
Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 57.1 | 61.9
Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 321.7 | 349.9
Level 3 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 82.3 | 88.9
Transfers in/out of Level 3 | 0.0 | (0.4)
Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 382.3 | 410.5
Balance at beginning of period | 57.9 | 40.1
Assets still held at year end | (6.8) | (0.7)
Net purchases, sales and settlements | 3.2 | 18.5
Balance at end of period | 54.3 | 57.9
Investment funds | Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 14.4 | 16.8
Investment funds | Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 313.6 | 335.8
Investment funds | Level 3 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 54.3 | 57.9
Transfers in/out of Level 3 | 0.0 | 0.0
Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 7.8 | 13.7
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 | 7.8 | 13.7
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 | 28.0 | 31.0
Balance at beginning of period | 31.0 | 32.1
Assets still held at year end | (3.0) | (1.1)
Net purchases, sales and settlements | 0.0 | 0.0
Balance at end of period | 28.0 | 31.0
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 | 28.0 | 31.0
Transfers in/out of Level 3 | 0.0 | 0.0
Fixed Income Funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 22.9 | 22.5
Fixed Income Funds | Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 22.6 | 22.1
Fixed Income Funds | Level 2 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 0.3 | 0.4
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 | 20.1 | 23.0
Balance at beginning of period | 0.0 | 0.3
Assets still held at year end | 0.0 | 0.0
Net purchases, sales and settlements | 0.0 | 0.1
Balance at end of period | 0.0 | 0.0
Other plan assets | Level 1 |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets | 20.1 | 23.0
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 | 0.0
Transfers in/out of Level 3 | $ 0.0 | $ (0.4)

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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + 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)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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