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Goodwill and Other Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
2013 $ 44.0
2014 43.6
2015 43.2
2016 42.7
2017 42.5
2018 and thereafter $ 398.9