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Goodwill and Intangible Assets, Net of Accumulated Amortization (Details) (USD $) In Millions, unless otherwise specified | May 31, 2013 | May 31, 2012
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Components of intangible assets, at cost |  |
Client lists | $ 231.0 | $ 223.6
Other intangible assets | 2.4 | 2.0
Total intangible assets, gross | 233.4 | 225.6
Less: Accumulated amortization | 188.2 | 169.8
Intangible assets, net of accumulated amortization | 45.2 | 55.8
Estimated future amortization expense relating to intangible assets |  |
Fiscal year ending May 31, 2014 | 14.9 |
Fiscal year ending May 31, 2015 | 10.8 |
Fiscal year ending May 31, 2016 | 7.7 |
Fiscal year ending May 31, 2017 | 5.5 |
Fiscal year ending May 31, 2018 | $ 3.5 |

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