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Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined contribution plans      
Employer contribution expenses $ 42.4 $ 41.5 $ 38.9
Amounts deferred under non-qualified deferred compensation plans $ 51.8 $ 46.4