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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Cumulative foreign currency translation | $ (104.1) | $ (147.3) |
Unrecognized pension costs (net of tax benefit of $30.7 in 2017 and $39.4 in 2016) | (86.5) | (78.0) |
Unrealized gain (loss) on cash flow hedges (net of tax expense of $0.7 in 2017 and $1.8 in 2016) | 4.5 | 4.2 |
Total accumulated other comprehensive income (loss) | (186.1) | (221.1) |
Unrecognized pension costs, tax benefit | 30.7 | 39.4 |
Unrealized gain (loss) on cash flow hedges, tax expense | 0.7 | 1.8 |
Foreign currency translation adjustment [Abstract] |  |  |
Foreign currency translation adjustment, pre-tax amount | 44.7 | (40.2) | $ (76.6)
Foreign currency translation adjustment, tax (expense) benefit | 0.0 | 0.0 | 0.0
Foreign currency translation adjustments, net-of-tax amount | 44.7 | (40.2) | (76.6)
Pension plans [Abstract] |  |  |
Net actuarial gains (losses) and prior service costs arising during the period, pre-tax amount | (17.6) | (12.5) | 0.5
Net actuarial gains (losses) and prior service costs arising during the period, tax (expense) benefit | 4.4 | 4.1 | 0.5
Net actuarial gains (losses) and prior service costs arising during the period, net-of-tax amount | (13.2) | (8.4) | 1.0
Amortization of net actuarial (gains) losses and prior service costs, pre-tax amount | 7.6 | 8.0 | 9.6
Amortization of net actuarial (gains) losses and prior service costs, tax (expense) benefit | (2.9) | (2.8) | (3.3)
Amortization of net actuarial (gains) losses and prior service costs, net-of-tax amount | 4.7 | 5.2 | 6.3
Unrealized gains (losses) on cash flow hedges [Abstract] |  |  |
Unrealized gains (losses) on cash flow hedges, pre-tax amount | 0.2 | 2.4 | 0.0
Unrealized gains (losses) on cash flow hedges, tax (expense) benefit | 0.1 | (0.8) | 0.0
Unrealized gains (losses) on cash flow hedges, net-of-tax amount | 0.3 | 1.6 | 0.0
Total other comprehensive income (loss), pre-tax amount | 34.9 | (42.3) | (66.5)
Total other comprehensive income (loss) | 1.6 | 0.5 | (2.8)
Total other comprehensive income (loss), net of tax | $ 36.5 | $ (41.8) | $ (69.3)

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration