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Summary of Significant Accounting Policies, Restructuring Costs (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs | $ 26.5 us-gaap_RestructuringCharges |  | $ 8.1 us-gaap_RestructuringCharges | $ 20.0 us-gaap_RestructuringCharges | $ 34.8 us-gaap_RestructuringCharges |  |  |  | $ 89.4 us-gaap_RestructuringCharges |  | $ 48.8 us-gaap_RestructuringCharges
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 41.4 us-gaap_RestructuringReserve |  | 48.4 us-gaap_RestructuringReserve |  | 41.4 us-gaap_RestructuringReserve |  |
Severance costs, net |  |  |  |  |  |  |  |  | 62.3 man_SeveranceCostsNet |  |
Office closure costs, net |  |  |  |  |  |  |  |  | 27.1 man_OfficeClosureCosts |  |
Costs paid or utilized |  |  |  |  |  |  | (35.5)us-gaap_PaymentsForRestructuring |  | (82.4)us-gaap_PaymentsForRestructuring |  |
Balance, end of year | 48.4 us-gaap_RestructuringReserve |  |  |  |  |  | 12.9 us-gaap_RestructuringReserve |  | 48.4 us-gaap_RestructuringReserve |  | 41.4 us-gaap_RestructuringReserve
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 3.8 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_US |  | 5.1 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_US |  | 3.8 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_US |  |
Severance costs, net |  |  |  |  |  |  |  |  | 7.8 man_SeveranceCostsNet / dei_EntityByLocationAxis = country_US |  |
Office closure costs, net |  |  |  |  |  |  |  |  | 1.8 man_OfficeClosureCosts / dei_EntityByLocationAxis = country_US |  |
Costs paid or utilized |  |  |  |  |  |  | (4.1)us-gaap_PaymentsForRestructuring / dei_EntityByLocationAxis = country_US |  | (8.3)us-gaap_PaymentsForRestructuring / dei_EntityByLocationAxis = country_US |  |
Balance, end of year | 5.1 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_US |  |  |  |  |  | 1.0 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_US |  | 5.1 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_US |  |
France [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 3.8 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_FR |  | 3.5 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_FR |  | 3.8 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_FR |  |
Severance costs, net |  |  |  |  |  |  |  |  | 0.6 man_SeveranceCostsNet / dei_EntityByLocationAxis = country_FR |  |
Office closure costs, net |  |  |  |  |  |  |  |  | 1.6 man_OfficeClosureCosts / dei_EntityByLocationAxis = country_FR |  |
Costs paid or utilized |  |  |  |  |  |  | (1.4)us-gaap_PaymentsForRestructuring / dei_EntityByLocationAxis = country_FR |  | (2.5)us-gaap_PaymentsForRestructuring / dei_EntityByLocationAxis = country_FR |  |
Balance, end of year | 3.5 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_FR |  |  |  |  |  | 2.1 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_FR |  | 3.5 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_FR |  |
Italy [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0.9 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_IT |  | 0.9 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_IT |  | 0.9 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_IT |  |
Severance costs, net |  |  |  |  |  |  |  |  | 3.4 man_SeveranceCostsNet / dei_EntityByLocationAxis = country_IT |  |
Costs paid or utilized |  |  |  |  |  |  | (0.9)us-gaap_PaymentsForRestructuring / dei_EntityByLocationAxis = country_IT |  | (3.4)us-gaap_PaymentsForRestructuring / dei_EntityByLocationAxis = country_IT |  |
Balance, end of year | 0.9 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_IT |  |  |  |  |  | 0 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_IT |  | 0.9 us-gaap_RestructuringReserve / dei_EntityByLocationAxis = country_IT |  |
Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 4.5 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] | 6.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] | 4.5 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] |
Severance costs, net |  |  |  |  |  |  |  |  | 15.2 man_SeveranceCostsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] |
Office closure costs, net |  |  |  |  |  |  |  |  | 2.8 man_OfficeClosureCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] |
Costs paid or utilized |  |  |  |  |  |  | (5.7)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] | (15.7)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] |
Balance, end of year | 6.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] |  |  |  |  | 1.1 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] | 6.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember | [1] |
Southern Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 4.7 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] | 4.5 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] | 4.7 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] |
Severance costs, net |  |  |  |  |  |  |  |  | 6.2 man_SeveranceCostsNet / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] |
Office closure costs, net |  |  |  |  |  |  |  |  | 1.6 man_OfficeClosureCosts / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] |
Costs paid or utilized |  |  |  |  |  |  | (2.2)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] | (8.0)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] |
Balance, end of year | 4.5 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] |  |  |  |  | 2.3 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] | 4.5 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_SouthernEuropeMember | [2] |
Northern Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 15.6 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  | 22.2 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  | 15.6 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Severance costs, net |  |  |  |  |  |  |  |  | 24.7 man_SeveranceCostsNet / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Office closure costs, net |  |  |  |  |  |  |  |  | 14.3 man_OfficeClosureCosts / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Costs paid or utilized |  |  |  |  |  |  | (16.4)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  | (32.4)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
Balance, end of year | 22.2 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |  |  |  |  | 5.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  | 22.2 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_NorthernEuropeMember |  |
APME [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  | 1.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  | 0 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Severance costs, net |  |  |  |  |  |  |  |  | 2.7 man_SeveranceCostsNet / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Office closure costs, net |  |  |  |  |  |  |  |  | 3.5 man_OfficeClosureCosts / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Costs paid or utilized |  |  |  |  |  |  | (1.3)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  | (4.4)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Balance, end of year | 1.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |  |  |  |  | 0.5 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  | 1.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_ApmeMember |  |
Right Management [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 6.6 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | 12.3 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | 6.6 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Severance costs, net |  |  |  |  |  |  |  |  | 9.1 man_SeveranceCostsNet / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Office closure costs, net |  |  |  |  |  |  |  |  | 4.9 man_OfficeClosureCosts / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Costs paid or utilized |  |  |  |  |  |  | (10.0)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | (8.3)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Balance, end of year | 12.3 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |  |  |  |  | 2.3 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | 12.3 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 10.0 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 0.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 10.0 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Severance costs, net |  |  |  |  |  |  |  |  | 4.4 man_SeveranceCostsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Office closure costs, net |  |  |  |  |  |  |  |  | 0 man_OfficeClosureCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Costs paid or utilized |  |  |  |  |  |  | 0.1 us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | (13.6)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Balance, end of year | $ 0.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  |  |  | $ 0.9 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | $ 0.8 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
[1] | Balance related to United States was $3.8 as of January 1, 2013. In 2013, United States incurred $7.8 for severance costs and $1.8 for office closure costs and paid/utilized $8.3, leaving a $5.1 liability as of December 31, 2013. In 2014, United States paid/utilized $4.1, leaving a $1.0 liability as of December 31, 2014.
[2] | Balance related to France was $3.8 as of January 1, 2013. In 2013, France incurred $0.6 for severance costs and $1.6 for office closure costs and paid/utilized $2.5, leaving a $3.5 liability as of December 31, 2013. In 2014, France paid/utilized $1.4, leaving a $2.1 liability as of December 31, 2014. Italy had a $0.9 liability as of January 1, 2013. In 2013, Italy recorded severance costs of $3.4 and paid out $3.4, leaving a $0.9 liability as of December 31, 2013. In 2014, Italy paid/utilized $0.9, leaving no liability as of December 31, 2014.

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