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Accumulated Other Comprehensive Loss (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]      
Unrealized gains on derivative instruments, tax $ 0 $ 0 $ 0
Unrecognized actuarial net losses, tax $ 36.9 $ 36.2 $ 18.9