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Accumulated other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table sets forth the changes in AOCI by component during the years ended December 31, 2020, 2019 and 2018:
(in millions) | Foreign Currency Translation Gain (Loss) |  | Net Actuarial Gain and Prior Service Cost |  | Amortization of Gain on Interest Rate Swap |  | Net Gain (Loss) on Marketable Securities Held in Trust |  | Total
Balance at December 31, 2017 | $ | (955.7) |  |  | $ | (94.7) |  |  | $ | (1.8) |  |  | $ | (9.4) |  |  | (1,061.6) |
Other comprehensive income | (621.4) |  |  | (8.2) |  |  | 2.3 |  |  | 4.8 |  |  | (622.5) |
Tax (expense) or benefit | 24.5 |  |  | (2.4) |  |  | (0.1) |  |  | (0.2) |  |  | 21.8 |
Other comprehensive income, net of tax | (596.9) |  |  | (10.6) |  |  | 2.2 |  |  | 4.6 |  |  | (600.7) |
Addback: loss attributable to noncontrolling interest | 5.2 |  |  | — |  |  | — |  |  | — |  |  | 5.2 |
Balance at December 31, 2018 | $ | (1,547.4) |  |  | $ | (105.3) |  |  | $ | 0.4 |  |  | $ | (4.8) |  |  | $ | (1,657.1) |
Other comprehensive income (loss) | 74.1 |  |  | (26.2) |  |  | 2.2 |  |  | 14.0 |  |  | 64.1 |
Tax (expense) or benefit | (4.7) |  |  | 1.9 |  |  | (0.5) |  |  | (3.1) |  |  | (6.4) |
Other comprehensive income (loss), net of tax | 69.4 |  |  | (24.3) |  |  | 1.7 |  |  | 10.9 |  |  | 57.7 |
Addback: loss attributable to noncontrolling interest | 1.2 |  |  | — |  |  | — |  |  | — |  |  | 1.2 |
Balance at December 31, 2019 | $ | (1,476.8) |  |  | $ | (129.6) |  |  | $ | 2.1 |  |  | $ | 6.1 |  |  | $ | (1,598.2) |
Other comprehensive income (loss) | (246.1) |  |  | 12.2 |  |  | 2.0 |  |  | 16.6 |  |  | (215.3) |
Tax (expense) or benefit | (3.4) |  |  | 7.7 |  |  | (0.4) |  |  | (3.8) |  |  | 0.1 |
Other comprehensive income (loss), net of tax | (249.5) |  |  | 19.9 |  |  | 1.6 |  |  | 12.8 |  |  | (215.2) |
Addback: loss attributable to noncontrolling interest | 7.2 |  |  | — |  |  | — |  |  | — |  |  | 7.2 |
Balance at December 31, 2020 | $ | (1,719.1) |  |  | $ | (109.7) |  |  | $ | 3.7 |  |  | $ | 18.9 |  |  | $ | (1,806.2) |

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- Definition Accumulated Other Comprehensive Income [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 2: 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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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