Taxation (Schedule of Deferred Tax Recognized on Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets	$ 269.1us-gaap_DeferredTaxAssetsGross	$ 259.9us-gaap_DeferredTaxAssetsGross
Valuation allowance	(72.7)	(102.8)
Deferred tax assets, net of valuation allowance	196.4us-gaap_DeferredTaxAssetsNet	157.1us-gaap_DeferredTaxAssetsNet
Total deferred tax liabilities	(482.9)us-gaap_DeferredIncomeTaxLiabilities	(473.3)us-gaap_DeferredIncomeTaxLiabilities
Deferred Tax Liabilities, Net	(286.5)	(316.2)
Deferred Compensation Arrangements [Member]
Deferred tax assets	56.2	59.6
Accrued Rent Expenses [Member]
Deferred tax assets	18.3	20.0
Tax Loss Carryforwards [Member]
Deferred tax assets	75.0	104.8
Postretirement Medical, Pension and Other Benefits [Member]
Deferred tax assets	25.5	32.6
Investment Basis Differences [Member]
Deferred tax assets	47.8	3.9
Accrued bonus [Member]
Deferred tax assets	46.3	25.9
Other Deferred Tax Assets [Member]
Deferred tax assets	0	13.1
Deferred Sales Commissions [Member]
Total deferred tax liabilities	(21.0)	(23.2)
Goodwill and Intangibles [Member]
Total deferred tax liabilities	(447.4)	(420.5)
Undistributed Earnings of Subsidiaries [Member]
Total deferred tax liabilities	(1.6)	(1.4)
Revaluation Reserve [Member]
Total deferred tax liabilities	(5.0)	(5.3)
Other Deferred Tax Liability [Member]
Total deferred tax liabilities	$ (7.9)	$ (22.9)

Deferred tax liabilities, net of deferred tax assets

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Liability

-URI http://asc.fasb.org/extlink&oid=6510232

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph b(2)

-Article 7

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 740

-SubTopic 10

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-Paragraph 2

-Subparagraph (b)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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