Fair Value of Assets and Liabilities - Fair Value Measurements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Document Period End Date	Dec. 31, 2016
Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Total	$ 88.2	$ 59.7
Fair value liabilities measured on recurring basis
Total	23.1	10.8
Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Total	72.6	49.2
Fair value liabilities measured on recurring basis
Total	8.5	9.3
Fair Value, Measurements, Recurring \| Level 2
Fair value assets measured on recurring basis
Total	15.6	10.5
Fair value liabilities measured on recurring basis
Total	14.6	1.5
Foreign exchange forward contracts \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Foreign exchange forward contracts	7.2	3.5
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	7.7	1.5
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 \| Level 2
Fair value assets measured on recurring basis
Foreign exchange forward contracts	7.2	3.5
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	7.7	1.5
Interest Rate Swap \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Foreign exchange forward contracts	8.4	0.0
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	6.9	0.0
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 \| Level 2
Fair value assets measured on recurring basis
Foreign exchange forward contracts	8.4	0.0
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	6.9	0.0
Certificates of deposit \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	64.1	39.9
Certificates of deposit \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	64.1	39.9
Certificates of deposit \| Fair Value, Measurements, Recurring \| Level 2
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	0.0	0.0
Foreign Exchange Option [Member] \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	7.0
Foreign Exchange Option [Member] \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	0.0
Foreign Exchange Option [Member] \| Fair Value, Measurements, Recurring \| Level 2
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	7.0
Assets held in rabbi trusts
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	8.5	9.3
Assets held in rabbi trusts \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Assets held in rabbi trusts	8.5	9.3
Fair value liabilities measured on recurring basis
Deferred compensation	8.5	9.3
Assets held in rabbi trusts \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Assets held in rabbi trusts	8.5	9.3
Fair value liabilities measured on recurring basis
Deferred compensation	8.5	9.3
Assets held in rabbi trusts \| Fair Value, Measurements, Recurring \| Level 2
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

Fair value of assets held under trust.

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- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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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, 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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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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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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