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Employee Benefit Plans (Textuals) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 15, 2019 | Apr. 03, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Transfer of pension plan asset to life insurance company |  |  |  |  |  | $ 73.5 | $ 100.0
transfer of pension plan obligation to Life Insurance company |  |  |  |  |  | $ 77.9 | $ 105.6
non-cash pension settlement loss | $ (38.6) | $ 60.6 | $ 0.6 | $ 99.2 | $ 0.4 |  |
Reclassification pension benefit obligations to AOCL | $ 4.4 | $ 5.6 |  |  |  |  |
UNITED STATES |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Projected benefit obligation (as a percent) |  |  | 82.00% |  |  |  |
Plan assets (as a percent) |  |  | 75.00% |  |  |  |
Components of fair value in our plan assets |  |  | 75.00% |  |  |  |
Foreign Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Long-term rate of return on assets assumption (as a percent) |  |  | 3.31% | 3.92% | 4.19% |  |
Discount rate (as a percent) | 2.15% |  | 1.48% | 2.15% |  |  |
CANADA |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Components of fair value in our plan assets |  |  | 11.00% |  |  |  |
UNITED KINGDOM |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Components of fair value in our plan assets |  |  | 14.00% |  |  |  |
Pension Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Estimated prior service (cost) credits |  |  | $ (0.2) |  |  |  |
Estimated actuarial gains (losses) |  |  | $ (6.9) |  |  |  |
Long-term rate of return on assets assumption (as a percent) |  |  | 6.50% | 6.50% | 6.50% |  |
Discount rate (as a percent) | 3.19% |  | 2.40% | 3.19% |  |  |
Fixed Income, Money Market, Cash and Guaranteed Investment Contracts [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target (as a percent) |  |  | 50.00% |  |  |  |
Equity Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target (as a percent) |  |  | 50.00% |  |  |  |
International Equity [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target (as a percent) |  |  | 6.00% |  |  |  |
U.S. Equity [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target (as a percent) |  |  | 44.00% |  |  |  |

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