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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Cumulative foreign currency translation | $ (200.2) | $ (170.1) |
Unrecognized pension costs (net of tax benefit of $30.5 in 2019 and $25.5 in 2018) | (96.1) | (69.7) |
Unrealized gain (loss) on cash flow hedges (net of tax expense of $0.3 in 2019 and $0.3 in 2018) | 5.9 | 6.1 |
Total accumulated other comprehensive income (loss) | (290.4) | (233.7) |
Unrecognized pension costs, tax benefit | 30.5 | 25.5 |
Unrealized gain (loss) on cash flow hedges, tax expense | 0.3 | 0.3 |
Foreign currency translation adjustment [Abstract] |  |  |
Foreign currency translation adjustment, pre-tax amount | (29.9) | (67.9) | $ 44.7
Foreign currency translation adjustment, tax (expense) benefit | 0.0 | 0.0 | 0.0
Foreign currency translation adjustments, net-of-tax amount | (29.9) | (67.9) | 44.7
Pension plans [Abstract] |  |  |
Net actuarial gains (losses) and prior service costs arising during the period, pre-tax amount | (30.6) | 9.6 | (17.6)
Net actuarial gains (losses) and prior service costs arising during the period, tax (expense) benefit | 7.4 | (1.8) | 4.4
Net actuarial gains (losses) and prior service costs arising during the period, net-of-tax amount | (23.2) | 7.8 | (13.2)
Amortization of net actuarial (gains) losses and prior service costs, pre-tax amount | 9.4 | 12.1 | 7.6
Amortization of net actuarial (gains) losses and prior service costs, tax (expense) benefit | (2.3) | (3.0) | (2.9)
Amortization of net actuarial (gains) losses and prior service costs, net-of-tax amount | 7.1 | 9.1 | 4.7
Unrealized gains (losses) on cash flow hedges [Abstract] |  |  |
Unrealized gains (losses) on cash flow hedges, pre-tax amount | 0.3 | 1.5 | 0.2
Unrealized gains (losses) on cash flow hedges, tax (expense) benefit | (0.1) | 0.1 | 0.1
Unrealized gains (losses) on cash flow hedges, net-of-tax amount | 0.2 | 1.6 | 0.3
Total other comprehensive income (loss), pre-tax amount | (50.8) | (44.7) | 34.9
Total other comprehensive income (loss) | 5.0 | (4.7) | 1.6
Total other comprehensive income (loss), net of tax | $ (45.8) | $ (49.4) | $ 36.5

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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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Balance Type: | debit
Period Type: | duration