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Leases
 12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Leases
Leases
The Company leases various property, plant and equipment.  Terms of the leases vary, but generally require the Company to pay property taxes, insurance premiums, and maintenance costs associated with the leased property.  Rental expense attributed to operating leases was $23.1 million, $16.8 million and $20.9 million in 2016, 2015 and 2014, respectively. 
Future minimum rental obligations under non-cancelable operating leases as of December 31, 2016 are payable as follows:
(in millions)
 
2017
$
19.9

2018
14.4

2019
12.7

2020
11.7

2021
11.2

Thereafter
27.5

Total
$
97.4