Rental expense and commitments (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 were as follows:

Year ended December 31,	2018		2017		2016
Rental expense, less income from subleases	$	67.4	$	71.7	$	77.4
Income from subleases	$	3.1	$	4.4	$	7.8

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, 2018, substantially all of which relate to real properties, were as follows:

Year
2019	$	48.5
2020	42.1
2021	30.0
2022	20.8
2023	14.3
Thereafter	24.4
Total	$	180.1