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Other Expense (Income) - Restructuring and Related Charges (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 | Feb. 28, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Charges |  |  | $ 0.4 | $ 4.5 | $ 2.5 | $ 4.5
2020 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related activities, period of implementation | 24 months |  |  |  |  |
Restructuring and related cost, cumulative cost incurred | $ 7.1 |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, December 31, 2020 |  |  |  |  | 4.6 |
Charges |  |  |  |  | 2.5 |
Cash payments |  |  |  |  | (2.3) |
Balance, September 30, 2021 |  |  | 4.8 |  | 4.8 |
2020 Restructuring Plan | Severance and benefits |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, December 31, 2020 |  |  |  |  | 4.6 |
Charges |  |  |  |  | 1.0 |
Cash payments |  |  |  |  | (1.4) |
Balance, September 30, 2021 |  |  | 4.2 |  | 4.2 |
2020 Restructuring Plan | Other charges |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, December 31, 2020 |  |  |  |  | 0.0 |
Charges |  |  |  |  | 1.5 |
Cash payments |  |  |  |  | (0.9) |
Balance, September 30, 2021 |  |  | 0.6 |  | 0.6 |
2020 Restructuring Plan | Minimum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related cost, expected cost | 15.0 |  | 9.0 |  | 9.0 |
Effect on future earnings, amount | 3.5 |  | 0.9 |  |  |
2020 Restructuring Plan | Maximum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related cost, expected cost | 17.0 |  | 11.0 |  | 11.0 |
Effect on future earnings, amount | $ 4.5 |  | 1.6 |  |  |
2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related activities, period of implementation |  | 24 months |  |  |  |
Restructuring and related cost, expected cost |  | $ 16.0 |  |  |  |
Restructuring and related cost, cumulative cost incurred |  |  | 13.7 |  | 13.7 |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, December 31, 2020 |  |  |  |  | 0.1 |
Cash payments |  |  |  |  | (0.1) |
Balance, September 30, 2021 |  |  | 0.0 |  | 0.0 |
2018 Restructuring Plan | Severance and benefits |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, December 31, 2020 |  |  |  |  | 0.1 |
Cash payments |  |  |  |  | (0.1) |
Balance, September 30, 2021 |  |  | $ 0.0 |  | $ 0.0 |

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