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Payables and Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued compensation	$ 472.5	$ 418.5
Unsettled fund share payables	103.1	83.2
Accrued income taxes	93.0	87.7
Accrued share repurchases	23.1	0.0
Accrued professional fees	22.5	26.1
Other	93.0	113.8
Payables and accrued liabilities	$ 807.2	$ 729.3

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- Definition

Payables Recorded For Share Repurchases

+ References

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Unsettled fund share payables are created by the normal settlement periods on transactions initiated by certain clients of Affiliate funds domiciled in the United Kingdom.

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(1),(5))
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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits.

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Amount of expenses incurred but not yet paid classified as other.

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