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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit obligation, period increase |  | $ 2,130.0 | $ 2,890.0 |
Curtailment gain | $ 28.0 |  |  |
Expense under the plans |  | $ 164.3 | 145.2 | $ 132.6
Percentage of global investments in plan assets |  | 80.00% |  |
Defined Benefit Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain |  | $ 0.0 | (2.2) | $ (1.3)
Total accumulated benefit obligation for our defined benefit pension plans |  | 17,030.0 | $ 15,170.0 |
Expected future employer contributions, next fiscal year |  | 40.0 |  |
Expected future employer discretionary contributions, next fiscal year |  | $ 10.0 |  |
Marketable equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, target allocation |  | 65.00% |  |
Developed markets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, target allocation |  | 35.00% |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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