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Contract Assets and Contract Liabilities - Change in Carrying Amount of Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Contract Assets |  |
Balance at beginning of year | $ 544.2 | $ 623.4
Acquisitions | 0.0 | 4.1
Recognized in current year | 441.6 | 759.2
Reclassified to accounts receivable | (423.5) | (868.7)
Foreign currency impact | (6.2) | (0.7)
Balance at end of period | 556.1 | 517.3
Contract Liabilities |  |
Balance at beginning of year | 831.2 | 799.7
Acquisitions | 1.7 | 6.9
Recognized in current year | 477.0 | 589.1
Amounts in beginning balance reclassified to revenue | (387.2) | (430.0)
Current year amounts reclassified to revenue | (154.3) | (152.6)
Foreign currency impact | (8.6) | (3.3)
Balance at end of period | $ 759.8 | $ 809.8

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- Definition Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, from business combination. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 + Details
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