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Goodwill, Changes in Goodwill (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period | $ 1,090.9 us-gaap_Goodwill | [1],[2] | $ 1,041.3 us-gaap_Goodwill | [1] |
Goodwill acquired | 39.4 us-gaap_GoodwillAcquiredDuringPeriod |  | 52.2 us-gaap_GoodwillAcquiredDuringPeriod |  |
Currency and other impacts | (55.1)us-gaap_GoodwillOtherChanges |  | (2.6)us-gaap_GoodwillOtherChanges |  |
Goodwill, end of period | 1,075.2 us-gaap_Goodwill | [1],[2] | 1,090.9 us-gaap_Goodwill | [1],[2] |
Accumulated impairment loss | 513.4 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  | 513.4 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  | 513.4 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
France [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period |  |  |  |  | 83.8 us-gaap_Goodwill / dei_EntityByLocationAxis = country_FR
Goodwill, end of period | 76.9 us-gaap_Goodwill / dei_EntityByLocationAxis = country_FR |  | 87.3 us-gaap_Goodwill / dei_EntityByLocationAxis = country_FR |  | 83.8 us-gaap_Goodwill / dei_EntityByLocationAxis = country_FR
Italy [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period |  |  |  |  | 5.5 us-gaap_Goodwill / dei_EntityByLocationAxis = country_IT
Goodwill, end of period | 5.0 us-gaap_Goodwill / dei_EntityByLocationAxis = country_IT |  | 5.7 us-gaap_Goodwill / dei_EntityByLocationAxis = country_IT |  | 5.5 us-gaap_Goodwill / dei_EntityByLocationAxis = country_IT
Americas [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period | 465.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [3] | 467.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [3] |
Goodwill acquired | 1.9 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  |
Currency and other impacts | (1.5)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | (1.2)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  |
Goodwill, end of period | 466.3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [3] | 465.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [3] |
Americas [Member] | United States [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period |  |  |  |  | 448.5 us-gaap_Goodwill / dei_EntityByLocationAxis = country_US / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember
Goodwill, end of period | 450.4 us-gaap_Goodwill / dei_EntityByLocationAxis = country_US / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | 448.5 us-gaap_Goodwill / dei_EntityByLocationAxis = country_US / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember |  | 448.5 us-gaap_Goodwill / dei_EntityByLocationAxis = country_US / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember
Southern Europe [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period | 107.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [4] | 103.3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [4] |
Goodwill acquired | 5.6 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember |  |
Currency and other impacts | (12.9)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember |  | 4.5 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember |  |
Goodwill, end of period | 100.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [4] | 107.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [4] |
Northern Europe [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period | 318.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  | 270.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Goodwill acquired | 28.0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  | 43.2 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Currency and other impacts | (34.9)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  | 4.3 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Goodwill, end of period | 311.3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  | 318.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
APME [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period | 72.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  | 73.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Goodwill acquired | 3.9 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  | 9.0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Currency and other impacts | (5.8)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  | (10.2)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Goodwill, end of period | 70.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  | 72.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Right Management [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period | 62.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | 62.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Currency and other impacts | 0 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | 0 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Goodwill, end of period | 62.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | 62.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Corporate [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning of period | 64.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [5] | 64.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [5] |
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Currency and other impacts | 0 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 0 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Goodwill, end of period | 64.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [5] | 64.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [5] |
Jefferson Wells [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, end of period | $ 55.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_JeffersonWellsMember |  |  |  |
[1] | Balances were net of accumulated impairment loss of $513.4 as of January 1, 2013, December 31, 2013 and December 31, 2014.
[2] | Balances were net of accumulated impairment loss of $513.4 as of both December 31, 2014 and 2013.
[3] | Balances related to United States were $448.5, $448.5 and $450.4 as of January 1, 2013, December 31, 2013 and December 31, 2014, respectively
[4] | Balances related to France were $83.8, $87.3 and $76.9 as of January 1, 2013, December 31, 2013 and December 31, 2014, respectively. Balances related to Italy were $5.5, $5.7 and $5.0 as of January 1, 2013, December 31, 2013 and December 31, 2014, respectively.
[5] | The majority of the Corporate balance as of December 31, 2014 relates to goodwill attributable to our acquisition of Jefferson Wells ($55.5) which is part of the United States reporting unit. For purposes of monitoring our total assets by segment, we do not allocate the Corporate balance to the respective reportable segments. We do, however, include these balances within the appropriate reporting units for our goodwill impairment testing. See the table below for the breakout of goodwill balances by reporting unit.

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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X
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Period Type: | duration

X
- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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