Fixed Assets and Lease Commitments - Schedule of fixed assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fixed assets
Fixed assets, at cost	$ 179.9	$ 169.4
Accumulated depreciation and amortization	(87.6)	(87.9)
Fixed assets, net	92.3	81.5
Building and leasehold improvements [Member]
Fixed assets
Fixed assets, at cost	78.5	74.7
Equipment [Member]
Fixed assets
Fixed assets, at cost	36.5	38.9
Furniture and fixtures [Member]
Fixed assets
Fixed assets, at cost	15.4	16.3
Land and improvements [Member]
Fixed assets
Fixed assets, at cost	18.9	18.1
Software [Member]
Fixed assets
Fixed assets, at cost	$ 30.6	$ 21.4

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant