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Borrowings - Additional Information (Detail) In Millions, unless otherwise specified | 6 Months Ended | 1 Months Ended | 6 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2012 USD ($) | Jun. 30, 2010 2.58% Senior Euro Notes USD ($) | Jun. 30, 2010 2.58% Senior Euro Notes EUR (€) | Jun. 30, 2012 2.58% Senior Euro Notes | Jun. 09, 2010 2.58% Senior Euro Notes USD ($) | Dec. 31, 2010 4.5 % Senior Notes USD ($) | Dec. 06, 2010 4.5 % Senior Notes USD ($) | Apr. 15, 2010 4.5 % Senior Notes | Dec. 31, 2011 4.2% Senior Notes USD ($) | Jun. 30, 2012 4.2% Senior Notes | Dec. 09, 2011 4.2% Senior Notes USD ($) | Jun. 30, 2012 Other Borrowings USD ($) | Jun. 30, 2012 Minimum 2.58% Senior Euro Notes | Jun. 30, 2012 Minimum Other Borrowings | Jun. 30, 2012 Maximum Other Borrowings | Jun. 30, 2012 Letters Of Credit USD ($) | Jun. 30, 2012 Swing line Loans USD ($) | Jun. 30, 2012 Revolving Credit Facility USD ($) | Jun. 30, 2012 Revolving Credit Facility Minimum | Jun. 30, 2012 Revolving Credit Facility Maximum
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Replaced credit facility due to expire | $ 600.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving facility principal amount | 700.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.0 | 25.0 |  |  |
Revolving facility expiration date | Jun. 27, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving facility closing date | Jun. 27, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate commitments of designated borrowers under the Credit Facility | 950.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.05% | 0.875% | 1.70%
Annual credit facility fee basis point rate spread over LIBOR | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25
Current borrowings under revolving facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 693.0 |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.0 |  |
Principal amount of private placement |  | 96.8 | 81.0 |  |  |  |  |  | 350.0 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 2.58% |  | 4.50% | 4.50% |  |  | 4.20% |  |  | 0.40% | 3.70% |  |  |  |  |
Debt instrument maturity period |  | Jun. 09, 2015 | Jun. 09, 2015 |  |  | Dec. 15, 2020 |  |  | Dec. 15, 2021 |  |  |  |  |  |  |  |  |  |  |
Debt instrument maximum amount outstanding |  |  |  |  | 750.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment, minimum percentage outstanding |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  | 300.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from debt offering |  |  |  |  |  |  | 295.7 |  |  |  | 346.2 |  |  |  |  |  |  |  |  |
Debt offering initial discount |  |  |  |  |  |  | 1.6 |  |  |  | 0.9 |  |  |  |  |  |  |  |  |
Debt offering underwriting commission |  |  |  |  |  | 1.9 |  |  | 2.3 |  |  |  |  |  |  |  |  |  |  |
Estimated offering expenses |  |  |  |  |  | 0.8 |  |  | 0.6 |  |  |  |  |  |  |  |  |  |  |
Contingent percentage of principal amount plus accrued and unpaid interest |  |  |  |  |  | 101.00% |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |
Outstanding repayment of indebtedness |  |  |  |  |  | 250.0 |  |  | 306.0 |  |  |  |  |  |  |  |  |  |  |
Other borrowings |  |  |  |  |  |  |  |  |  |  |  | $ 10.6 |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 |  |  |  |  |  |  |

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