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Long-Term Debt and Commitments, Summary of Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Feb. 14, 2017 | Jun. 23, 2015
Long-Term Debt and Commitments [Abstract] |  |  |  |
Total long-term debt | $ 934.2 | $ 826.4 |  |
Less: Current maturities | 1.0 | 2.1 |  |
Long-term debt | 933.2 | 824.3 |  |
Term Loan Facility - Variable Tranche [Member] |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |
Total long-term debt | $ 535.6 | 642.0 | $ 788.0 | $ 1,078.0
Maturity date | Feb. 14, 2024 |  |  |
Unamortized discount and deferred financing costs | $ 12.4 | 16.0 |  |
Senior Notes due 2028 [Member] |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |
Total long-term debt | $ 393.9 | 0.0 |  |
Maturity date | Jun. 30, 2028 |  |  |
Unamortized deferred financing cost | $ 6.1 |  |  |
Term Loan Facility - Fixed Tranche [Member] |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |
Total long-term debt | $ 0.0 | 177.8 |  | $ 300.0
Maturity date | May 09, 2021 |  |  |
Unamortized discount and deferred financing costs | $ 0.0 | 0.2 |  |
Netherlands Term Loan Due 2020 [Member] |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |
Total long-term debt | $ 0.0 | 1.1 |  |
Maturity date | Dec. 31, 2020 |  |  |
Netherlands Term Loan Due 2022 [Member] |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |
Total long-term debt | $ 0.6 | 1.0 |  |
Maturity date | Dec. 31, 2022 |  |  |
Japan Loan Facilities [Member] |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |
Total long-term debt | $ 4.1 | $ 4.5 |  |

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