Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Narrative) (Details)

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Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Intangible Assets [Abstract]  
Intangible asset amortization expense $ 12.2
Estimated amortization expense, 2012 48.7
Estimated amortization expense, 2013 46.3
Estimated amortization expense, 2014 44.6
Estimated amortization expense, 2015 42.8
Estimated amortization expense, 2016 $ 41.1