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Financial Instruments - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | $ 2,642.8 | $ 2,597.4 | $ 2,528.3
Other comprehensive income (loss) before reclassifications | 23.8 | (6.8) |
Amounts reclassified from accumulated other comprehensive income (loss) | 3.3 | 4.2 |
Income tax benefit |  | 0.6 |
Other comprehensive income (loss) | 27.1 | (2.0) | (29.9)
Balance at the end of the period | 2,537.7 | 2,642.8 | 2,597.4
Accrued post-retirement benefit liability |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | (40.5) | (38.5) |
Other comprehensive income (loss) before reclassifications | (5.3) | (6.0) |
Amounts reclassified from accumulated other comprehensive income (loss) | 5.3 | 3.4 |
Income tax benefit |  | 0.6 |
Other comprehensive income (loss) | 0.0 | (2.0) |
Balance at the end of the period | (40.5) | (40.5) | (38.5)
Foreign currency translation |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | (82.5) | (80.4) |
Other comprehensive income (loss) before reclassifications | 39.4 | (2.1) |
Other comprehensive income (loss) | 39.4 | (2.1) |
Balance at the end of the period | (43.1) | (82.5) | (80.4)
Derivative contracts |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | (1.1) | (3.2) |
Other comprehensive income (loss) before reclassifications | (10.3) | 1.3 |
Amounts reclassified from accumulated other comprehensive income (loss) | (2.0) | 0.8 |
Income tax benefit |  | 0.0 |
Other comprehensive income (loss) | (12.3) | 2.1 |
Balance at the end of the period | (13.4) | (1.1) | (3.2)
Accumulated Other Comprehensive Income (loss). |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | (124.1) | (122.1) | (85.7)
Other comprehensive income (loss) | 27.1 | (2.0) | (29.9)
Balance at the end of the period | $ (97.0) | $ (124.1) | $ (122.1)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details
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