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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Change in Accumulated Other Comprehensive Loss | The following tables summarize the changes in each component of Accumulated other comprehensive loss, net of tax:
(in millions) (a) | Actuarial Losses |  | Prior Service Costs |  | Foreign Currency Translation |  | Unrealized Gain (Loss) on Interest Rate Swaps |  | Total
Balance at January 1, 2020 | $ | (80.4) |  |  | $ | (2.4) |  |  | $ | (7.1) |  |  | $ | 0.8 |  |  | $ | (89.1) |
Other comprehensive (loss) income before reclassifications | (10.6) |  |  | (0.3) |  |  | 8.4 |  |  | (3.3) |  |  | (5.8) |
Amounts reclassified from accumulated other comprehensive loss | 2.8 |  |  | 0.1 |  |  | — |  |  | 0.3 |  |  | 3.2 |
Net current-period other comprehensive (loss) income | (7.8) |  |  | (0.2) |  |  | 8.4 |  |  | (3.0) |  |  | (2.6) |
Balance at December 31, 2020 | $ | (88.2) |  |  | $ | (2.6) |  |  | $ | 1.3 |  |  | $ | (2.2) |  |  | $ | (91.7) |
(in millions) (a) | Actuarial Losses |  | Prior Service Costs |  | Foreign Currency Translation |  | Unrealized Gain (Loss) on Interest Rate Swaps |  | Total
Balance at January 1, 2019 | $ | (87.4) |  |  | $ | (2.5) |  |  | $ | (8.9) |  |  | $ | 1.5 |  |  | $ | (97.3) |
Other comprehensive income before reclassifications | 4.5 |  |  | — |  |  | 1.8 |  |  | — |  |  | 6.3 |
Amounts reclassified from accumulated other comprehensive loss | 2.5 |  |  | 0.1 |  |  | — |  |  | (0.7) |  |  | 1.9 |
Net current-period other comprehensive income (loss) | 7.0 |  |  | 0.1 |  |  | 1.8 |  |  | (0.7) |  |  | 8.2 |
Balance at December 31, 2019 | $ | (80.4) |  |  | $ | (2.4) |  |  | $ | (7.1) |  |  | $ | 0.8 |  |  | $ | (89.1) |
(a) Amounts in parentheses indicate losses.
Reclassifications from Accumulated Other Comprehensive Loss | The following table summarizes the amounts reclassified from Accumulated other comprehensive loss, net of tax, and the affected line item in the Consolidated Statements of Operations:
Details about Accumulated Other Comprehensive Loss Components |  | Amount Reclassified from Accumulated Other Comprehensive Loss |  | Affected Line Item in Consolidated Statements of Operations
| 2020 |  | 2019 |
|  | (in millions) (a) |  |
Amortization of actuarial losses of defined benefit pension plans |  | $ | (3.7) |  |  | $ | (3.3) |  |  | Other expense, net
Amortization of prior service costs of defined benefit pension plans |  | (0.1) |  |  | (0.1) |  |  | Other expense, net
Interest rate swaps |  | (0.4) |  |  | 1.0 |  |  | Interest expense
Total before tax |  | (4.2) |  |  | (2.4) |  |  |
Income tax benefit |  | 1.0 |  |  | 0.5 |  |  | Income tax expense
Total reclassifications for the period, net of tax |  | $ | (3.2) |  |  | $ | (1.9) |  |  |
(a) Amount in parentheses indicate debits to profit/loss.

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