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Goodwill and Other Intangible Assets, Changes in Goodwill (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | $ 1,075.2 us-gaap_Goodwill | [1] |
Goodwill acquired | 18.3 us-gaap_GoodwillAcquiredDuringPeriod |  |
Currency and other impacts | (36.7)us-gaap_GoodwillOtherChanges |  |
Goodwill, end of period | 1,056.8 us-gaap_Goodwill | [1] |
France [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period |  |  | 76.9 us-gaap_Goodwill / dei_EntityByLocationAxis = country_FR
Goodwill, end of period | 68.2 us-gaap_Goodwill / dei_EntityByLocationAxis = country_FR |  | 76.9 us-gaap_Goodwill / dei_EntityByLocationAxis = country_FR
Italy [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period |  |  | 5.0 us-gaap_Goodwill / dei_EntityByLocationAxis = country_IT
Goodwill, end of period | 4.4 us-gaap_Goodwill / dei_EntityByLocationAxis = country_IT |  | 5.0 us-gaap_Goodwill / dei_EntityByLocationAxis = country_IT
Americas [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 466.3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [2] |
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [2] |
Currency and other impacts | (1.3)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [2] |
Goodwill, end of period | 465.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [2] |
Americas [Member] | United States [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period |  |  | 450.4 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 |  | 450.4 us-gaap_Goodwill / dei_EntityByLocationAxis = country_US / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember
Southern Europe [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 100.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [3] |
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [3] |
Currency and other impacts | (10.8)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [3] |
Goodwill, end of period | 89.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [3] |
Northern Europe [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 311.3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Goodwill acquired | 18.3 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Currency and other impacts | (23.6)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Goodwill, end of period | 306.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
APME [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 70.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Currency and other impacts | (1.0)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Goodwill, end of period | 69.1 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 |  |
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Currency and other impacts | 0 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Goodwill, end of period | 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 | [4] |
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [4] |
Currency and other impacts | 0 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [4] |
Goodwill, end of period | 64.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [4] |
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 both March 31, 2015 and December 31, 2014.
[2] | Balances related to the United States were $450.4 as of both January 1, 2015 and March 31, 2015.
[3] | Balances related to France were $76.9 and $68.2 as of January 1, 2015 and March 31, 2015, respectively. Balances related to Italy were $5.0 and $4.4 as of January 1, 2015 and March 31, 2015, respectively.
[4] | The majority of the Corporate balance relates to goodwill attributable to our acquisition of Jefferson Wells ($55.5) which is now 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 as this is commensurate with how we operate our business. We do, however, include these balances within the appropriate reporting units for our goodwill impairment testing. See 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of other (increase) decrease of an asset representing the 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 (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_EntityByLocationAxis=country_FR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_EntityByLocationAxis=country_IT
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=man_ApmeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=man_JeffersonWellsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=man_NorthernEuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=man_RightManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=man_SouthernEuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |