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Pension, Health Care and Postretirement Benefits Other Than Pensions - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) employee pension_plan shares | Dec. 31, 2018 USD ($) employee shares | Dec. 31, 2017 USD ($) employee | Dec. 31, 2016 USD ($)
Defined benefit pension plans |  |  |  |  |
Shares of company stock included in transfer |  | $ 131.8 |  |  |
Minimum | Equity Securities |  |  |  |  |
Expected defined benefit payments |  |  |  |  |
Target allocation percentage of plan assets in equity securities |  | 35.00% |  |  |
Minimum | Fixed Income Securities |  |  |  |  |
Expected defined benefit payments |  |  |  |  |
Target allocation percentage of plan assets in equity securities |  | 35.00% |  |  |
Maximum | Equity Securities |  |  |  |  |
Expected defined benefit payments |  |  |  |  |
Target allocation percentage of plan assets in equity securities |  | 65.00% |  |  |
Maximum | Fixed Income Securities |  |  |  |  |
Expected defined benefit payments |  |  |  |  |
Target allocation percentage of plan assets in equity securities |  | 55.00% |  |  |
Postretirement Health Coverage |  |  |  |  |
Health care plans |  |  |  |  |
Number of active employees entitled to receive benefits under health care plans | employee |  | 27,030 | 26,323 | 26,565 |
Cost of benefits includes claims incurred and claims incurred but not reported under health care plans |  | $ 301.6 | $ 298.8 | $ 281.2 |
Defined Benefit Pension |  |  |  |  |
Defined benefit pension plans |  |  |  |  |
Fair value of plan assets |  | 325.7 | 864.1 | 935.1 |
Expected defined benefit payments |  |  |  |  |
Expected cash payments, 2020 |  | 13.5 |  |  |
Expected cash payments, 2021 |  | 13.1 |  |  |
Expected cash payments, 2022 |  | 14.0 |  |  |
Expected cash payments, 2023 |  | 15.3 |  |  |
Expected cash payments, 2024 |  | 16.5 |  |  |
Expected cash payments, 2025-2029 |  | 88.9 |  |  |
Amortization of actuarial losses |  | 1.0 |  |  |
Amortization of prior service cost (credit) |  | 1.4 |  |  |
Defined Benefit Pension | Domestic Defined Benefit Pension Plans |  |  |  |  |
Defined contribution pension plans |  |  |  |  |
Contributions by company |  | 72.7 | 65.2 | 38.4 |
Defined benefit pension plans |  |  |  |  |
Settlement charge |  | 32.4 | 37.6 | (2.0) |
Projected benefit obligation |  | 103.0 | 524.7 | 916.2 | $ 632.8
Fair value of plan assets |  | 125.9 | 777.0 | 1,188.6 | 847.0
Excess (deficient) plan assets over projected benefit obligations |  | 22.9 | 252.3 | 272.4 |
Accumulated benefit obligation |  | $ 97.2 | $ 521.0 | 913.4 |
Expected defined benefit payments |  |  |  |  |
Equity investment in domestic defined benefit pension plan assets (in shares) | shares |  | 0 | 300,000 |  |
Market value of common shares invested in defined benefit pension plan assets |  |  | $ 118.0 | 123.0 |
Defined Benefit Pension | Domestic Defined Benefit Pension Plans | Minimum |  |  |  |  |
Defined contribution pension plans |  |  |  |  |
Contributions by company (percentage) |  | 2.00% |  |  |
Defined Benefit Pension | Domestic Defined Benefit Pension Plans | Maximum |  |  |  |  |
Defined contribution pension plans |  |  |  |  |
Contributions by company (percentage) |  | 7.00% |  |  |
Defined Benefit Pension | Foreign Defined Benefit Pension Plans |  |  |  |  |
Defined contribution pension plans |  |  |  |  |
Contributions by company |  | $ 24.5 | 19.5 | 10.5 |
Defined benefit pension plans |  |  |  |  |
Settlement charge |  | 0.3 | (0.4) | 0.1 |
Projected benefit obligation |  | 360.7 | 315.8 | 349.6 | 206.9
Fair value of plan assets |  | 288.1 | 253.5 | 280.0 | 165.0
Excess (deficient) plan assets over projected benefit obligations |  | $ (72.6) | (62.3) | (69.6) |
Number of defined benefit plans | pension_plan |  | 31 |  |  |
Accumulated benefit obligation |  | $ 331.7 | 280.0 | 308.2 |
Expected defined benefit payments |  |  |  |  |
Estimated future employer contributions |  | $ 4.6 |  |  |
Defined Benefit Pension | Foreign Defined Benefit Pension Plans | Valspar |  |  |  |  |
Defined benefit pension plans |  |  |  |  |
Number of defined benefit plans | pension_plan |  | 12 |  |  |
Defined Benefit Pension | Overfunded Plan | Domestic Defined Benefit Pension Plans |  |  |  |  |
Defined benefit pension plans |  |  |  |  |
Projected benefit obligation |  | $ 103.0 | 524.7 | 916.2 |
Fair value of plan assets |  | 125.9 | 777.0 | 1,189.0 |
Excess (deficient) plan assets over projected benefit obligations |  | 22.9 | 252.3 | 272.4 |
Defined Benefit Pension | Unfunded Plan | Foreign Defined Benefit Pension Plans |  |  |  |  |
Defined benefit pension plans |  |  |  |  |
Projected benefit obligation |  | 236.6 |  |  |
Fair value of plan assets |  | 143.8 |  |  |
Excess (deficient) plan assets over projected benefit obligations |  | $ 92.8 |  |  |
Number of foreign defined benefit pension plans unfunded or underfunded | pension_plan |  | 26 |  |  |
Accumulated benefit obligation |  | $ 208.3 |  |  |
Postretirement Benefits Other than Pensions |  |  |  |  |
Defined benefit pension plans |  |  |  |  |
Settlement charge |  |  |  | (9.3) |
Projected benefit obligation |  | 280.5 | $ 274.6 | $ 290.8 | $ 265.1
Expected defined benefit payments |  |  |  |  |
Expected cash payments, 2020 |  | 17.5 |  |  |
Expected cash payments, 2021 |  | 16.8 |  |  |
Expected cash payments, 2022 |  | 17.2 |  |  |
Expected cash payments, 2023 |  | 17.2 |  |  |
Expected cash payments, 2024 |  | 18.7 |  |  |
Expected cash payments, 2025-2029 |  | 88.3 |  |  |
Amortization of actuarial losses |  | 2.0 |  |  |
Amortization of prior service cost (credit) |  | $ (1.1) |  |  |
Number of retired employees entitled to receive postretirement benefits | employee |  | 3,481 | 3,498 | 3,486 |
Defined benefit plan ultimate health care cost trend rate and prescription drug cost increase rate (percentage) |  | 4.50% |  |  |
Terminated Plan | Defined Benefit Pension |  |  |  |  |
Defined benefit pension plans |  |  |  |  |
Settlement charge | $ 32.4 |  |  |  |
Replacement plan | Defined Benefit Pension |  |  |  |  |
Defined benefit pension plans |  |  |  |  |
Surplus transferred upon termination and replacement |  | $ 242.2 |  |  |
Shares of company stock included in transfer |  | $ 131.8 |  |  |
Shares of company stock included in transfer (in shares) | shares |  | 300,000 |  |  |

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