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Accumulated Other Comprehenive Income (Loss) | 6 Months Ended
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Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table sets forth the changes in AOCI, net of tax, by component during the three and six months ended June 30, 2021 and June 30, 2020:
| 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
Three Months Ended June 30, 2021 |  |  |  |  |  |  |  |  |
Balance at March 31, 2021 | $ | (1,822.9) |  |  | $ | (105.9) |  |  | $ | 4.2 |  |  | $ | 1.1 |  |  | $ | (1,923.5) |
Other comprehensive income (loss) | 287.9 |  |  | 1.3 |  |  | 0.5 |  |  | 3.6 |  |  | 293.3 |
Tax (expense) benefit | 9.3 |  |  | (0.1) |  |  | — |  |  | — |  |  | 9.2 |
Other comprehensive income (loss), net of tax | 297.2 |  |  | 1.2 |  |  | 0.5 |  |  | 3.6 |  |  | 302.5 |
Other comprehensive income (loss) attributable to noncontrolling interest | (3.3) |  |  | — |  |  | — |  |  | — |  |  | (3.3) |
Balance as of June 30, 2021 | $ | (1,529.0) |  |  | $ | (104.7) |  |  | $ | 4.7 |  |  | $ | 4.7 |  |  | $ | (1,624.3) |
Three Months Ended June 30, 2020 |  |  |  |  |  |  |  |  |
Balance at March 31, 2020 | $ | (2,072.9) |  |  | $ | (127.8) |  |  | $ | 2.6 |  |  | $ | 14.1 |  |  | $ | (2,184.0) |
Other comprehensive income (loss) | 56.5 |  |  | 2.6 |  |  | 0.5 |  |  | 12.5 |  |  | 72.1 |
Tax (expense) benefit | (1.2) |  |  | 3.4 |  |  | (0.2) |  |  | (4.6) |  |  | (2.6) |
Other comprehensive income (loss), net of tax | 55.3 |  |  | 6.0 |  |  | 0.3 |  |  | 7.9 |  |  | 69.5 |
Other comprehensive income (loss) attributable to noncontrolling interest | 1.3 |  |  | — |  |  | — |  |  | — |  |  | 1.3 |
Balance as of June 30, 2020 | $ | (2,016.3) |  |  | $ | (121.8) |  |  | $ | 2.9 |  |  | $ | 22.0 |  |  | $ | (2,113.2) |
Six Months Ended June 30, 2021 |  |  |  |  |  |  |  |  |
Balance at December 31, 2020 | $ | (1,719.1) |  |  | $ | (109.7) |  |  | $ | 3.7 |  |  | $ | 18.9 |  |  | $ | (1,806.2) |
Other comprehensive income (loss) | 173.5 |  |  | 2.6 |  |  | 1.0 |  |  | (14.2) |  |  | 162.9 |
Tax (expense) benefit | 17.6 |  |  | 2.4 |  |  | — |  |  | — |  |  | 20.0 |
Other comprehensive income (loss), net of tax | 191.1 |  |  | 5.0 |  |  | 1.0 |  |  | (14.2) |  |  | 182.9 |
Other comprehensive income (loss) attributable to noncontrolling interest | (1.0) |  |  | — |  |  | — |  |  | — |  |  | (1.0) |
Balance as of June 30, 2021 | $ | (1,529.0) |  |  | $ | (104.7) |  |  | $ | 4.7 |  |  | $ | 4.7 |  |  | $ | (1,624.3) |
Six Months Ended June 30, 2020 |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 | $ | (1,476.8) |  |  | $ | (129.6) |  |  | $ | 2.1 |  |  | $ | 6.1 |  |  | $ | (1,598.2) |
Other comprehensive income (loss) | (539.4) |  |  | 12.3 |  |  | 1.0 |  |  | 20.5 |  |  | (505.6) |
Tax (expense) benefit | (8.7) |  |  | (4.5) |  |  | (0.2) |  |  | (4.6) |  |  | (18.0) |
Other comprehensive income (loss), net of tax | (548.1) |  |  | 7.8 |  |  | 0.8 |  |  | 15.9 |  |  | (523.6) |
Other comprehensive income (loss) attributable to noncontrolling interest | 8.6 |  |  | — |  |  | — |  |  | — |  |  | 8.6 |
Balance as of June 30, 2020 | $ | (2,016.3) |  |  | $ | (121.8) |  |  | $ | 2.9 |  |  | $ | 22.0 |  |  | $ | (2,113.2) |

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- Definition Accumulated Other Comprehensive Income (Loss) [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=124509347&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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