Supplemental Cash Flow Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Supplemental Cash Flow [Line Items]
Interest	$ 6.1	$ 4.4
Income taxes	18.9	19.4
Captial lease arrangments	5.1	14.0
Shares of Common Stock for Defined Benefit Plan Contribution	361,446
Shares of Common Stock for Defined Benefit Plan Contribution - Value per Share	$ 24.90
Value of Shares of Common Stock for Defined Benefit Plan Contribution	$ 9.0

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The amount of cash paid for interest during the period.

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The dollar amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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