Significant Accounting Policies - Summary of Impacts of ASU on Condensed Consolidated Financial Statements (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	$ 2,071.0	$ 1,836.7	$ 2,007.6	$ 2,017.6	$ 2,068.3	$ 1,813.1	$ 1,949.5	$ 1,972.4	$ 7,932.9	$ 7,803.3	$ 7,668.4
Research and development									391.7	369.9	365.6
Selling, general and administrative									3,379.3	3,104.7	2,944.6
Goodwill and intangible asset impairment									979.7	331.5	31.1
Acquisition, integration and related									133.7	279.8	504.9
Quality remediation									146.9	181.3	53.4
Operating expenses									7,899.1	7,004.0	6,847.3
Operating Profit									33.8	799.3	821.1
Other expense, net									(15.6)	(9.4)	(66.5)
Accounts receivable, less allowance for doubtful accounts	1,275.8				1,544.1				1,275.8	1,544.1
Inventories	2,256.5				2,068.3				2,256.5	2,068.3
Prepaid expenses and other current assets	352.3				428.0				352.3	428.0
Other current liabilities	$ 1,391.3				1,349.3				$ 1,391.3	1,349.3
Reclassifications [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Research and development										2.5
Selling, general and administrative										142.7	22.4
Goodwill and intangible asset impairment										26.8	31.1
Acquisition, integration and related										279.8	504.9
Quality remediation										181.3	53.4
Special items										(633.1)	(611.8)
As Previously Reported [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales										7,824.1	7,683.9
Research and development										367.4
Selling, general and administrative										2,973.9	2,932.9
Goodwill and intangible asset impairment										304.7
Special items										633.1	611.8
Operating expenses										7,015.9	6,858.0
Operating Profit										808.2	825.9
Other expense, net										(18.3)	(71.3)
Accounts receivable, less allowance for doubtful accounts					1,494.6					1,494.6
Inventories					2,081.8					2,081.8
Prepaid expenses and other current assets					414.5					414.5
Other current liabilities					1,299.8					1,299.8
ASU 2014-09 [Member] | New Revenue Standard Adjustment [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales										(20.8)	(15.5)
Selling, general and administrative										(20.8)	(15.5)
Operating expenses										(20.8)	(15.5)
Accounts receivable, less allowance for doubtful accounts					49.5					49.5
Inventories					(13.5)					(13.5)
Prepaid expenses and other current assets					13.5					13.5
Other current liabilities					$ 49.5					49.5
ASU 2017-07 [Member] | New Pension Standard Adjustment [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Selling, general and administrative										8.9	4.8
Operating expenses										8.9	4.8
Operating Profit										(8.9)	(4.8)
Other expense, net										$ 8.9	$ 4.8