Fair Value of Assets and Liabilities - Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Total	$ 39.8	$ 90.8
Fair value liabilities measured on recurring basis
Total	6.3	9.4
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Total	13.5	16.5
Fair value liabilities measured on recurring basis
Total	6.7	15.7
Foreign exchange forward contracts \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	0.0
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	0.0	0.0
Foreign exchange forward contracts \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	3.4	6.7
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	3.1	10.2
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	0.0
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	0.0	0.0
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	4.8	7.6
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	3.6	5.5
Certificates of deposit \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	33.5	81.4
Certificates of deposit \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	0.0	0.0
Assets held in rabbi trusts
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	6.3	9.4
Assets held in rabbi trusts \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Assets held in rabbi trusts	6.3	9.4
Fair value liabilities measured on recurring basis
Deferred compensation		9.4
Assets held in rabbi trusts \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	0.0	0.0
Fair value liabilities measured on recurring basis
Deferred compensation	0.0	0.0
Other Current Assets [Member] \| Interest Rate Swap \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	0.0
Other Current Assets [Member] \| Interest Rate Swap \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	$ 5.3	$ 2.2

Fair value of assets held under trust.

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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 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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