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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2013
Fair value measured on recurring basis
Level 2
Dec. 31, 2012
Fair value measured on recurring basis
Level 2
Dec. 31, 2013
Fair value measured on recurring basis
Level 2
Interest Rate Swap Agreements
Dec. 31, 2013
Fair value measured on recurring basis
Level 2
Foreign Currency Forward Exchange Contracts
Fair value of assets and liabilities          
Derivative assets   $ 14.0 $ 6.6   $ 14.0
Derivative liabilities   $ 1.3 $ 2.7 $ 0.6 $ 0.7
Number of counterparties, which experienced significant downgrades 0