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Other Comprehensive Income - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Equity [Abstract] |  |
Pension and OPEB liability adjustments, Pre-tax | $ 1.1 | $ 1.3
Unrealized (loss) gain on derivative instruments, Pre-tax | 1.8 | 1.7
Unrealized foreign currency translation adjustments, Pre-tax | 9.5 | 5.9
Total other comprehensive income (loss), Pre-tax | 12.4 | 8.9
Pension and OPEB liability adjustments, Tax | (0.4) | (0.2)
Unrealized (loss) gain on derivative instruments, Tax | (0.1) | (0.4)
Unrealized foreign currency translation adjustments, Tax | (1.1) | 0.0
Total other comprehensive income (loss), Tax | (1.6) | (0.6)
Pension and OPEB liability adjustments, Net of Tax | 0.7 | 1.1
Unrealized gain (loss) on financial instruments, net of realized gain (loss), Net of Tax | 1.7 | 1.3
Unrealized foreign currency translation adjustments, Net of Tax | 8.4 | 5.9
Other comprehensive income | $ 10.8 | $ 8.3

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- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 + Details
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