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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Cash Flow Elements [Abstract]      
Cash paid for interest $ 5.1 $ 5.2 $ 6.2
Cash paid for income taxes $ 95.2 $ 75.6 $ 61.2