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Employee Benefit Plans (Fair Values of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 1,366.4 | $ 1,354.6
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 65.0 | 51.8
Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 551.1 | 613.4
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 616.9 | 592.0
Assets held by insurance companies and other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 133.4 | 97.4
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 338.6 | 493.1
Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 63.1 | 51.2
Level 1 | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 53.9 | 145.3
Level 1 | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 211.4 | 292.6
Level 1 | Assets held by insurance companies and other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 10.2 | 4.0
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 946.2 | 788.1
Level 2 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1.9 | 0.6
Level 2 | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 497.2 | 468.1
Level 2 | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 405.5 | 299.4
Level 2 | Assets held by insurance companies and other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 41.6 | 20.0
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 81.6 | 73.4
Level 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Level 3 | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Level 3 | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Level 3 | Assets held by insurance companies and other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 81.6 | $ 73.4

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