Significant Accounting Policies - Summary of Impacts of ASU on Condensed Consolidated Financial Statements (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	$ 2,007.6	$ 1,949.5	$ 4,025.2	$ 3,921.9
Research and development	99.1	92.6	194.8	183.7
Selling, general and administrative	791.3	752.2	1,593.0	1,527.9
Intangible asset impairment		26.8		26.8
Acquisition, integration and related	50.5	72.5	96.5	130.7
Quality remediation	37.5	49.9	80.1	84.3
Operating expenses	1,711.6	1,669.4	3,424.2	3,293.7
Operating Profit	296.0	280.1	601.0	628.2
Other expense, net	(2.9)	(1.7)	(6.5)	(2.2)
Accounts receivable, less allowance for doubtful accounts	1,335.3		1,335.3		$ 1,544.1
Inventories	2,158.5		2,158.5		2,068.3
Prepaid expenses and other current assets	500.2		500.2		428.0
Other current liabilities	$ 1,186.2		$ 1,186.2		1,349.3
Reclassifications [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Research and development		2.5		2.5
Selling, general and administrative		6.9		24.4
Intangible asset impairment		26.8		26.8
Acquisition, integration and related		72.5		130.7
Quality remediation		49.9		84.3
Special items		(158.6)		(268.7)
As Previously Reported [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales		1,954.4		3,931.7
Research and development		90.1		181.2
Selling, general and administrative		748.0		1,508.8
Special items		158.6		268.7
Operating expenses		1,672.1		3,299.0
Operating Profit		282.3		632.7
Other expense, net		(3.9)		(6.7)
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		(4.9)		(9.8)
Selling, general and administrative		(4.9)		(9.8)
Operating expenses		(4.9)		(9.8)
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		4.5
Operating expenses		2.2		4.5
Operating Profit		(2.2)		(4.5)
Other expense, net		$ 2.2		$ 4.5