Financial instruments and concentration of credit risks (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location

The following table summarizes the fair value of the company’s foreign exchange forward contracts.

As of December 31,	2020		2019
Balance Sheet Location
Prepaid expenses and other current assets	$	1.4	$	2.1
Other accrued liabilities	1.0		0.1
Total fair value	$	0.4	$	2.0

Gains and Losses Recognized on Foreign Exchange Forward Contracts

The following table summarizes the location and amount of gains and losses recognized on foreign exchange forward contracts.

Year Ended December 31,	2020		2019		2018
Statement of Income Location
Other (expense), net	$	7.6	$	1.7	$	(14.2)