Description of Business and Significant Accounting Policies - Summary of Impact of Adoption of Topic 606 on Consolidated Statement of Operations and Condensed Consolidated Balance Sheet (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 348.6	$ 495.7
Accounts receivable, net	1,841.5	2,163.5
Inventories	1,606.7	1,760.7
Prepaid expenses and other current assets	313.1	294.8
Current assets held for sale	0.0	1,243.8
Total current assets	4,109.9	5,958.5
Property, plant and equipment, net	1,154.9	1,226.1
Goodwill	3,708.8	3,873.9	$ 7,801.9
Other intangible assets, net	4,916.4	6,150.6
Deferred income taxes	150.6	183.3
Other assets	361.3	330.0
Total assets	15,642.0	17,722.4
Liabilities:
Accounts payable	1,101.4	1,191.6
Accrued compensation	203.9	192.9
Other accrued liabilities	1,340.3	1,307.9
Short-term debt and current portion of long-term debt	332.4	318.7
Current liabilities held for sale	0.0	292.4
Total current liabilities	2,978.0	3,303.5
Long-term debt	5,391.3	6,696.3
Deferred income taxes	624.9	1,090.0
Other noncurrent liabilities	1,110.4	1,379.4
Total liabilities	10,646.0	12,469.2
Stockholders’ equity:
Total stockholders' equity	4,996.0	5,253.2	14,181.3	$ 11,384.4
Total liabilities and stockholders' equity	15,642.0	17,722.4
Income Statement Classification [Abstract]
Net sales	9,714.9	10,154.0	11,170.4
Cost of products sold	6,495.5	6,636.3	7,359.9
Gross profit	3,219.4	3,517.7	3,810.5
Selling, general and administrative expenses	2,451.0	2,647.8	2,924.1
Restructuring costs, net	27.1	86.8	95.3
Impairment of goodwill, intangibles and other assets	1,223.0	8,337.1	84.3
Operating income (loss)	(481.7)	(7,554.0)	706.8
Non-operating expenses:
Interest expense, net	303.3	446.2	468.9
Loss on extinguishment of debt	28.3	4.1	32.3
Other (income) expense, net	38.3	(12.6)	(713.7)
Income (loss) before income taxes	(851.6)	(7,991.7)	919.3
Income tax expense (benefit)	(1,037.7)	(1,358.9)	(1,515.0)
Income (loss) from continuing operations	186.1	(6,632.8)	2,434.3
Loss from discontinued operations, net of tax	(79.5)	(309.7)	314.5
Net loss	$ 106.6	$ (6,942.5)	$ 2,748.8
Weighted average common shares outstanding:
Basic (in shares)	423.3	473.7	486.7
Diluted (in shares)	423.9	473.7	488.0
Basic:
Loss from continuing operations (in USD per share)	$ 0.44	$ (14.00)	$ 5.00
Loss from discontinued operations (in USD per share)	(0.19)	(0.65)	0.65
Net loss (in USD per share)	0.25	(14.65)	5.65
Diluted:
Loss from continuing operations (in USD per share)	0.44	(14.00)	4.99
Loss from discontinued operations (in USD per share)	(0.19)	(0.65)	0.64
Net loss (in USD per share)	$ 0.25	$ (14.65)	$ 5.63
As Previously Reported
Assets:
Cash and cash equivalents		$ 495.7
Accounts receivable, net		1,850.7
Inventories		1,583.1
Prepaid expenses and other current assets		278.0
Current assets held for sale		3,541.3
Total current assets		7,748.8
Property, plant and equipment, net		925.6
Goodwill		2,970.2
Other intangible assets, net		5,579.6
Deferred income taxes		165.2
Other assets		327.0
Total assets		17,716.4
Liabilities:
Accounts payable		1,019.5
Accrued compensation		159.1
Other accrued liabilities		1,182.3
Short-term debt and current portion of long-term debt		318.7
Current liabilities held for sale		650.4
Total current liabilities		3,330.0
Long-term debt		6,696.3
Deferred income taxes		1,041.8
Other noncurrent liabilities		1,370.5
Total liabilities		12,438.6
Stockholders’ equity:
Total stockholders' equity		5,277.8
Total liabilities and stockholders' equity		17,716.4
Income Statement Classification [Abstract]
Net sales		8,630.9
Cost of products sold		5,622.1
Gross profit		3,008.8
Selling, general and administrative expenses		2,434.8
Restructuring costs, net		80.5
Impairment of goodwill, intangibles and other assets		8,322.0
Operating income (loss)		(7,828.5)
Non-operating expenses:
Interest expense, net		446.3
Loss on extinguishment of debt		4.1
Other (income) expense, net		(11.2)
Income (loss) before income taxes		(8,267.7)
Income tax expense (benefit)		(1,478.1)
Income (loss) from continuing operations		(6,789.6)
Loss from discontinued operations, net of tax		(128.3)
Net loss		$ (6,917.9)
Weighted average common shares outstanding:
Basic (in shares)		473.7
Diluted (in shares)		473.7
Basic:
Loss from continuing operations (in USD per share)		$ (14.33)
Loss from discontinued operations (in USD per share)		(0.27)
Net loss (in USD per share)		(14.60)
Diluted:
Loss from continuing operations (in USD per share)		(14.33)
Loss from discontinued operations (in USD per share)		(0.27)
Net loss (in USD per share)		$ (14.60)
Revision
Assets:
Cash and cash equivalents		$ 0.0
Accounts receivable, net		0.0
Inventories		0.0
Prepaid expenses and other current assets		(2.4)
Current assets held for sale		(6.1)
Total current assets		(8.5)
Property, plant and equipment, net		0.0
Goodwill		0.0
Other intangible assets, net		0.0
Deferred income taxes		14.5
Other assets		0.0
Total assets		6.0
Liabilities:
Accounts payable		0.0
Accrued compensation		0.0
Other accrued liabilities		(0.8)
Short-term debt and current portion of long-term debt		0.0
Current liabilities held for sale		100.4
Total current liabilities		99.6
Long-term debt		0.0
Deferred income taxes		(66.7)
Other noncurrent liabilities		(2.3)
Total liabilities		30.6
Stockholders’ equity:
Total stockholders' equity		(24.6)
Total liabilities and stockholders' equity		6.0
Income Statement Classification [Abstract]
Net sales		0.0
Cost of products sold		0.0
Gross profit		0.0
Selling, general and administrative expenses		0.0
Restructuring costs, net		0.0
Impairment of goodwill, intangibles and other assets		0.0
Operating income (loss)		0.0
Non-operating expenses:
Interest expense, net		0.0
Loss on extinguishment of debt		0.0
Other (income) expense, net		0.0
Income (loss) before income taxes		0.0
Income tax expense (benefit)		0.0
Income (loss) from continuing operations		0.0
Loss from discontinued operations, net of tax		(24.6)
Net loss		$ (24.6)
Weighted average common shares outstanding:
Basic (in shares)		473.7
Diluted (in shares)		473.7
Basic:
Loss from continuing operations (in USD per share)		$ 0
Loss from discontinued operations (in USD per share)		(0.05)
Net loss (in USD per share)		(0.05)
Diluted:
Loss from continuing operations (in USD per share)		0
Loss from discontinued operations (in USD per share)		(0.05)
Net loss (in USD per share)		$ (0.05)
As Revised
Assets:
Cash and cash equivalents		$ 495.7
Accounts receivable, net		1,850.7
Inventories		1,583.1
Prepaid expenses and other current assets		275.6
Current assets held for sale		3,535.2
Total current assets		7,740.3
Property, plant and equipment, net		925.6
Goodwill		2,970.2
Other intangible assets, net		5,579.6
Deferred income taxes		179.7
Other assets		327.0
Total assets		17,722.4
Liabilities:
Accounts payable		1,019.5
Accrued compensation		159.1
Other accrued liabilities		1,181.5
Short-term debt and current portion of long-term debt		318.7
Current liabilities held for sale		750.8
Total current liabilities		3,429.6
Long-term debt		6,696.3
Deferred income taxes		975.1
Other noncurrent liabilities		1,368.2
Total liabilities		12,469.2
Stockholders’ equity:
Total stockholders' equity		5,253.2
Total liabilities and stockholders' equity		17,722.4
Income Statement Classification [Abstract]
Net sales		8,630.9
Cost of products sold		5,622.1
Gross profit		3,008.8
Selling, general and administrative expenses		2,434.8
Restructuring costs, net		80.5
Impairment of goodwill, intangibles and other assets		8,322.0
Operating income (loss)		(7,828.5)
Non-operating expenses:
Interest expense, net		446.3
Loss on extinguishment of debt		4.1
Other (income) expense, net		(11.2)
Income (loss) before income taxes		(8,267.7)
Income tax expense (benefit)		(1,478.1)
Income (loss) from continuing operations		(6,789.6)
Loss from discontinued operations, net of tax		(152.9)
Net loss		$ (6,942.5)
Weighted average common shares outstanding:
Basic (in shares)		473.7
Diluted (in shares)		473.7
Basic:
Loss from continuing operations (in USD per share)		$ (14.33)
Loss from discontinued operations (in USD per share)		(0.32)
Net loss (in USD per share)		(14.65)
Diluted:
Loss from continuing operations (in USD per share)		(14.33)
Loss from discontinued operations (in USD per share)		(0.32)
Net loss (in USD per share)		$ (14.65)
Reclassification
Assets:
Cash and cash equivalents		$ 0.0
Accounts receivable, net		312.8
Inventories		177.6
Prepaid expenses and other current assets		19.2
Current assets held for sale		(2,291.4)
Total current assets		(1,781.8)
Property, plant and equipment, net		300.5
Goodwill		903.7
Other intangible assets, net		571.0
Deferred income taxes		3.6
Other assets		3.0
Total assets		0.0
Liabilities:
Accounts payable		172.1
Accrued compensation		33.8
Other accrued liabilities		126.4
Short-term debt and current portion of long-term debt		0.0
Current liabilities held for sale		(458.4)
Total current liabilities		(126.1)
Long-term debt		0.0
Deferred income taxes		114.9
Other noncurrent liabilities		11.2
Total liabilities		0.0
Stockholders’ equity:
Total stockholders' equity		0.0
Total liabilities and stockholders' equity		0.0
Income Statement Classification [Abstract]
Net sales		1,523.1
Cost of products sold		1,014.2
Gross profit		508.9
Selling, general and administrative expenses		213.0
Restructuring costs, net		6.3
Impairment of goodwill, intangibles and other assets		15.1
Operating income (loss)		274.5
Non-operating expenses:
Interest expense, net		(0.1)
Loss on extinguishment of debt		0.0
Other (income) expense, net		(1.4)
Income (loss) before income taxes		276.0
Income tax expense (benefit)		119.2
Income (loss) from continuing operations		156.8
Loss from discontinued operations, net of tax		(156.8)
Net loss		$ 0.0
Weighted average common shares outstanding:
Basic (in shares)		473.7
Diluted (in shares)		473.7
Basic:
Loss from continuing operations (in USD per share)		$ 0.33
Loss from discontinued operations (in USD per share)		(0.33)
Net loss (in USD per share)		0
Diluted:
Loss from continuing operations (in USD per share)		0.33
Loss from discontinued operations (in USD per share)		(0.33)
Net loss (in USD per share)		$ 0
Excluding Adjustments due to Topic 606
Income Statement Classification [Abstract]
Net sales		$ 230.5
Cost of products sold		222.8
Selling, general and administrative expenses		8.4
Operating income (loss)		(0.7)
Non-operating expenses:
Income tax expense (benefit)		(0.2)
Income (loss) from continuing operations		(0.5)
Loss from discontinued operations, net of tax		0.0
Net loss		(0.5)
As Adjusted
Income Statement Classification [Abstract]
Net sales		10,384.5
Cost of products sold		6,859.1
Selling, general and administrative expenses		2,656.2
Operating income (loss)		(7,554.7)
Non-operating expenses:
Income tax expense (benefit)		(1,359.1)
Income (loss) from continuing operations		(6,633.3)
Loss from discontinued operations, net of tax		(309.7)
Net loss		$ (6,943.0)