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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Minimum Rental Payments for Operating Leases
Future minimum lease payments at December 31, 2017 under these non-cancelable leases are as follows:
(in millions)
 
Year Ended December 31,
 
2018
$
39.5

2019
29.6

2020
22.5

2021
20.1

2022
15.5

Thereafter
40.1

 
$
167.3