Fair value of assets held under trust.

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- Definition

Amount of transfers of liabilities measured on a recurring basis between levels of the fair value hierarchy.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Fair value of obligations measured on a recurring basis.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Fair Value of Assets and Liabilities - Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Transfers Between Levels Amount	$ 0.0	$ 0.0
Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Total	28.0		$ 45.5
Fair value liabilities measured on recurring basis
Total	8.5		12.3
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Total	28.0		43.8
Fair value liabilities measured on recurring basis
Total	6.7		6.6
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Total	0.0		1.7
Fair value liabilities measured on recurring basis
Total	1.8		5.7
Assets held in rabbi trusts [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	6.7		6.6
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	21.3		37.2
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	21.3		37.2
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	0.0		0.0
Securities and other investments \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	6.7		6.6
Securities and other investments \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	6.7		6.6
Securities and other investments \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	0.0		0.0
Other current assets \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Derivative Asset	0.0		1.7
Other current assets \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Derivative Asset	0.0		0.0
Other current assets \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Derivative Asset	0.0		1.7
Other current liabilities \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	0.0		2.7
Other current liabilities \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	0.0		0.0
Other current liabilities \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	0.0		2.7
Other liabilities \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Deferred compensation	6.7		6.6
Other liabilities \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value liabilities measured on recurring basis
Deferred compensation	6.7		6.6
Other liabilities \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Deferred compensation	0.0		0.0
Other liabilities \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	1.8		3.0
Other liabilities \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	0.0		0.0
Other liabilities \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	$ 1.8		$ 3.0