Summary of Changes in Equity Components (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Minority Interest [Line Items]
Balance at December 31, 2018	$ 1,896.8	$ 4,169.4
Comprehensive Income:
Net income	111.5	122.4
Foreign currency translation	20.8	91.6
Net change in cash flow hedges		0.4
Defined benefit pension plan	0.1	0.6
Comprehensive income	132.4	215.0
Stock-based compensation	1.6
Cash dividends declared	(54.3)	(54.2)
Distribution to Veoneer	(2.5)
Balance at March 31, 2019	1,974.0	4,342.0
Common stock
Minority Interest [Line Items]
Balance at December 31, 2018	102.8
Comprehensive Income:
Balance at March 31, 2019	102.8
Additional paid in capital
Minority Interest [Line Items]
Balance at December 31, 2018	1,329.3
Comprehensive Income:
Balance at March 31, 2019	1,329.3
Retained earnings
Minority Interest [Line Items]
Balance at December 31, 2018	2,041.8
Comprehensive Income:
Net income	111.4
Comprehensive income	111.4
Cash dividends declared	(54.3)
Distribution to Veoneer	(2.5)
Balance at March 31, 2019	2,096.4
Accumulated other comprehensive (loss) income
Minority Interest [Line Items]
Balance at December 31, 2018	(423.2)
Comprehensive Income:
Foreign currency translation	20.5
Defined benefit pension plan	0.1
Comprehensive income	20.6
Balance at March 31, 2019	(402.6)
Treasury stock
Minority Interest [Line Items]
Balance at December 31, 2018	(1,167.0)
Comprehensive Income:
Stock-based compensation	1.6
Balance at March 31, 2019	(1,165.4)
Total parent shareholders' equity
Minority Interest [Line Items]
Balance at December 31, 2018	1,883.7	4,035.1
Comprehensive Income:
Net income	111.4	126.7
Foreign currency translation	20.5	85.8
Net change in cash flow hedges		0.4
Defined benefit pension plan	0.1	0.6
Comprehensive income	132.0	213.5
Stock-based compensation	1.6
Cash dividends declared	(54.3)	(54.2)
Distribution to Veoneer	(2.5)
Balance at March 31, 2019	1,960.5	4,206.2
Non-controlling interest
Minority Interest [Line Items]
Balance at December 31, 2018	13.1	134.3
Comprehensive Income:
Net income	0.1	(4.3)
Foreign currency translation	0.3	5.8
Comprehensive income	0.4	1.5
Balance at March 31, 2019	$ 13.5	$ 135.8