Restructuring Activities - Components of Restructuring Accrual, Spending and Other Activity and Accrual Balance Remaining (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restructuring Reserve [Roll Forward]
Restructuring accrual, beginning of period	$ 14.7	$ 11.3	$ 14.3
Headcount accrual and accrual adjustments	15.6	12.1	14.5
Contract termination accrual and adjustments	15.6	12.1	14.5
Cash payments	(17.2)	(8.6)	(16.9)
Effect of changes in foreign currency exchange rates	0.2	(0.1)	(0.6)
Restructuring accrual, end of period	24.3	$ 14.7	$ 11.3
Present value of lease liabilities	95.9
Contract Termination
Restructuring Reserve [Roll Forward]
Contract termination accrual and adjustments	14.6
Present value of lease liabilities	3.7
Contract Terminations Excluding Leases
Restructuring Reserve [Roll Forward]
Contract termination accrual and adjustments	$ 11.0

Present value of lessee's discounted obligation for lease payments from operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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-URI https://asc.fasb.org//1943274/2147482017/420-10-50-1

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- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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-URI https://asc.fasb.org//1943274/2147482017/420-10-50-1

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147482017/420-10-50-1

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