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Pension, Health Care and Postretirement Benefits Other Than Pensions - Summary of the Fair Value of the Defined Benefit Pension Plan Assets (Details) - Defined Benefit Pension - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | $ 325.7 | $ 864.1 | $ 935.1
Total investments | 414.0 | 1,030.5 | 1,468.6
Fair Value Measured at NAV or Equivalent |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments measured at NAV or its equivalent | 88.3 | 166.4 | 533.5
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 37.6 | 586.8 | 556.7
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 288.1 | 277.3 | 378.4
Equity investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 115.7 | 215.8 | 515.0
Equity investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 7.9 | 124.0 | 409.9
Equity investments | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 107.8 | 91.8 | 105.1
Fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 173.4 | 609.9 | 380.9
Fixed income investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 29.7 | 462.8 | 146.8
Fixed income investments | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 143.7 | 147.1 | 234.1
Other assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | 36.6 | 38.4 | 39.2
Other assets | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments in fair value hierarchy | $ 36.6 | $ 38.4 | $ 39.2

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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