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Leases (Tables)
12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
The following is a schedule by year of future minimum payments required under the operating leases that have initial or remaining noncancelable lease terms in excess of one year as of December 31, 2016: 
in millions
 
2017
$
13.6

2018
14.0

2019
13.9

2020
13.6

2021
13.4

2022 and thereafter
94.2

Total minimum lease payments
$
162.7