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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future minimum obligations under operating leases
The future minimum obligations under operating leases, including those associated with discontinued operations, having a non-cancelable term in excess of one year are as follows (in millions):
Year
 
Amount
2018
 
$
18.0

2019
 
15.6

2020
 
11.2

2021
 
10.0

2022
 
9.2

Thereafter
 
39.2

Future minimum obligations
 
$
103.2