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Leases (Tables)
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Future minimum rental obligations under non-cancelable operating leases
Future minimum rental obligations under non-cancelable operating leases, as of December 31, 2014, are payable as follows:
(in millions)
 
2015
$
42.4

2016
33.5

2017
23.3

2018
17.0

2019
14.9

Thereafter
23.3

Total
$
154.4