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Intangible Assets - Estimated Future Amortization Expense for Amortizable Intangible Assets (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Estimated future amortization expense 2016 $ 201.3
Estimated future amortization expense 2017 187.4
Estimated future amortization expense 2018 179.0
Estimated future amortization expense 2019 172.7
Estimated future amortization expense 2020 $ 166.6