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Intangible Assets Estimated future amortization of other intangible assets (Tables)
 12 Months Ended
Dec. 31, 2017
Summary of Other Intangible Assets [Abstract]  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]


The estimated annual amortization expense for other intangible assets for the next five years as of December 31, 2017 is listed below.
 
 
2018
 
2019
 
2020
 
2021
 
2022
Estimated amortization expense
 
$
23.3

 
$
22.1

 
$
20.4

 
$
19.3

 
$
16.4