Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Number of foreign currency exchange rate derivatives held by the entity at the reporting date.

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The cash outflow to acquire securities classified as trading securities and held for investment purposes. Excludes payments for trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

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The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

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Fair Value Measurement Narrative (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended		1 Months Ended
	Nov. 30, 2010	Dec. 31, 2014 forward_exchange_contrtact	Dec. 31, 2013	May 31, 2008
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale investments		$ 43.0us-gaap_AvailableForSaleSecurities	$ 38.6us-gaap_AvailableForSaleSecurities
Available-for-sale debt securities		43.0	38.6
Trading securities		8.9us-gaap_TradingSecurities	7.3us-gaap_TradingSecurities
Purchase of trading securities held-for-investment		1.2	0.9
Proceeds from the sale of trading securities held-for-investment		0.2	0
Number of foreign exchange contracts held		18
Derivative, notional amount		1.0invest_DerivativeNotionalAmount
Gain (loss) on forward interest rate lock, recorded in accumulated other comprehensive loss	(0.4)
Interest rate lock reclassified to interest expense			0
Long-term Debt		597.6us-gaap_LongTermDebtNoncurrent	597.2us-gaap_LongTermDebtNoncurrent
Long-term debt, fair value		645.1us-gaap_LongTermDebtFairValue	631.0us-gaap_LongTermDebtFairValue
Interest Rate Lock 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on forward interest rate lock, recorded in accumulated other comprehensive loss	(1.6)
Interest Rate Lock 2008
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on forward interest rate lock, recorded in accumulated other comprehensive loss				1.2
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale investments		0	0
Available-for-sale debt securities		43.0	38.6
Trading securities		8.9	7.3
Quoted Prices in Active Markets for Similar Assets (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale investments		43.0	38.6
Trading securities		$ 0	$ 0