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Rental expense and commitments (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Rental Expense and Income from Subleases
Rental expense and income from subleases for the three years ended December 31, 2017 were as follows:
Year ended December 31,
2017

 
2016

 
2015

Rental expense, less income from subleases
$
71.7

 
$
77.4

 
$
80.6

Income from subleases
$
4.4

 
$
7.8

 
$
9.1

Schedule of Minimum Net Rental Commitments Under Noncancelable Operating Leases
Minimum net rental commitments under noncancelable operating leases, including idle leases, outstanding at December 31, 2017, substantially all of which relate to real properties, were as follows:
Year
 
2018
$
47.4

2019
41.3

2020
32.9

2021
21.5

2022
16.2

Thereafter
39.4

Total
$
198.7