Significant Accounting Policies - Summary of Impacts of ASU on Condensed Consolidated Financial Statements (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	$ 1,836.7	$ 1,813.1	$ 5,861.9	$ 5,735.0
Research and development	95.7	91.2	290.5	274.9
Selling, general and administrative	787.7	711.7	2,380.7	2,239.6
Goodwill and intangible asset impairment	3.8	32.7	3.8	59.5
Acquisition, integration and related	17.4	61.6	113.9	192.3
Quality remediation	32.2	51.1	112.3	135.4
Operating expenses	1,613.4	1,601.9	5,037.6	4,895.6
Operating Profit	223.3	211.2	824.3	839.4
Other expense, net	(2.2)	(2.3)	(8.7)	(4.5)
Accounts receivable, less allowance for doubtful accounts	1,262.7		1,262.7		$ 1,544.1
Inventories	2,219.5		2,219.5		2,068.3
Prepaid expenses and other current assets	506.5		506.5		428.0
Other current liabilities	$ 1,249.2		$ 1,249.2		1,349.3
Reclassifications [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Research and development				2.5
Selling, general and administrative		20.0		44.4
Goodwill and intangible asset impairment		32.7		59.5
Acquisition, integration and related		61.6		192.3
Quality remediation		51.1		135.4
Special items		(165.4)		(434.1)
As Previously Reported [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales		1,818.1		5,749.8
Research and development				272.4
Selling, general and administrative		694.5		2,203.3
Special items		165.4		434.1
Operating expenses		1,604.7		4,903.7
Operating Profit		213.4		846.1
Other expense, net		(4.5)		(11.2)
Accounts receivable, less allowance for doubtful accounts					1,494.6
Inventories					2,081.8
Prepaid expenses and other current assets					414.5
Other current liabilities					1,299.8
ASU 2014-09 [Member] | New Revenue Standard Adjustment [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales		(5.0)		(14.8)
Selling, general and administrative		(5.0)		(14.8)
Operating expenses		(5.0)		(14.8)
Accounts receivable, less allowance for doubtful accounts					49.5
Inventories					(13.5)
Prepaid expenses and other current assets					13.5
Other current liabilities					$ 49.5
ASU 2017-07 [Member] | New Pension Standard Adjustment [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Selling, general and administrative		2.2		6.7
Operating expenses		2.2		6.7
Operating Profit		(2.2)		(6.7)
Other expense, net		$ 2.2		$ 6.7