Financial Statements of Parent Company Guarantor - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 113.3	$ 238.5	$ 126.3	$ 110.4
Accounts and notes receivable, net	831.6	764.0
Inventories	581.0	524.2
Other current assets	222.9	253.4
Current assets held for sale	0.0	891.9
Total current assets	1,748.8	2,672.0
Property, plant and equipment, net	545.5	538.6	539.8
Other assets
Investments in subsidiaries	0.0	0.0
Goodwill	4,351.1	4,217.4	4,259.0
Intangibles, net	1,558.4	1,631.8
Other non-current assets	429.9	182.1
Non-current assets held for sale	0.0	2,292.9
Total other assets	6,339.4	8,324.2
Total assets	8,633.7	11,534.8	11,833.5
Current liabilities
Current maturities of long-term debt and short-term borrowings	0.0	0.8
Accounts payable	495.7	436.6
Employee compensation and benefits	186.6	166.1
Other current liabilities	517.1	511.5
Current liabilities held for sale	0.0	356.2
Total current liabilities	1,199.4	1,471.2
Other liabilities
Long-term debt	1,440.7	4,278.4
Pension and other post-retirement compensation and benefits	285.6	253.4
Deferred tax liabilities	394.8	609.5
Other non-current liabilities	275.4	162.0
Non-current liabilities held for sale	0.0	505.9
Total liabilities	3,595.9	7,280.4
Equity
Total equity	5,037.8	4,254.4	4,008.8	4,663.8
Total liabilities and equity	8,633.7	11,534.8
Parent Company Guarantor
Current assets
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts and notes receivable, net	0.0	0.1
Inventories	0.0	0.0
Other current assets	10.8	1.2
Current assets held for sale		0.0
Total current assets	10.8	1.3
Property, plant and equipment, net	0.0	0.0
Other assets
Investments in subsidiaries	5,205.1	4,509.5
Goodwill	0.0	0.0
Intangibles, net	0.0	0.0
Other non-current assets	2.2	2.2
Non-current assets held for sale	0.0	0.0
Total other assets	5,207.3	4,511.7
Total assets	5,218.1	4,513.0
Current liabilities
Current maturities of long-term debt and short-term borrowings		0.0
Accounts payable	1.4	0.7
Employee compensation and benefits	0.4	0.8
Other current liabilities	99.6	95.2
Current liabilities held for sale		0.0
Total current liabilities	101.4	96.7
Other liabilities
Long-term debt	48.4	148.1
Pension and other post-retirement compensation and benefits	0.0	0.0
Deferred tax liabilities	0.0	0.0
Other non-current liabilities	30.5	13.8
Non-current liabilities held for sale		0.0
Total liabilities	180.3	258.6
Equity
Total equity	5,037.8	4,254.4
Total liabilities and equity	5,218.1	4,513.0
Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts and notes receivable, net	0.0	0.0
Inventories	0.0	0.0
Other current assets	1.8	4.1
Current assets held for sale		0.0
Total current assets	1.8	4.1
Property, plant and equipment, net	0.0	0.0
Other assets
Investments in subsidiaries	5,109.6	4,471.4
Goodwill	0.0	0.0
Intangibles, net	0.0	0.0
Other non-current assets	0.0	35.2
Non-current assets held for sale	94.1	0.0
Total other assets	5,203.7	4,506.6
Total assets	5,205.5	4,510.7
Current liabilities
Current maturities of long-term debt and short-term borrowings		0.0
Accounts payable	0.0	0.0
Employee compensation and benefits	0.0	0.0
Other current liabilities	0.4	1.2
Current liabilities held for sale		0.0
Total current liabilities	0.4	1.2
Other liabilities
Long-term debt	0.0	0.0
Pension and other post-retirement compensation and benefits	0.0	0.0
Deferred tax liabilities	0.0	0.0
Other non-current liabilities	0.0	0.0
Non-current liabilities held for sale		0.0
Total liabilities	0.4	1.2
Equity
Total equity	5,205.1	4,509.5
Total liabilities and equity	5,205.5	4,510.7
Subsidiary Issuer
Current assets
Cash and cash equivalents	0.0	0.0	0.1	0.1
Accounts and notes receivable, net	0.0	0.0
Inventories	0.0	0.0
Other current assets	1.5	1.1
Current assets held for sale		0.0
Total current assets	1.5	1.1
Property, plant and equipment, net	0.0	0.0
Other assets
Investments in subsidiaries	7,156.1	9,295.5
Goodwill	0.0	0.0
Intangibles, net	0.0	0.0
Other non-current assets	0.0	717.8
Non-current assets held for sale	614.0	0.0
Total other assets	7,770.1	10,013.3
Total assets	7,771.6	10,014.4
Current liabilities
Current maturities of long-term debt and short-term borrowings		0.0
Accounts payable	0.0	0.1
Employee compensation and benefits	0.0	0.0
Other current liabilities	9.4	26.7
Current liabilities held for sale		0.0
Total current liabilities	9.4	26.8
Other liabilities
Long-term debt	2,652.8	5,515.9
Pension and other post-retirement compensation and benefits	0.0	0.0
Deferred tax liabilities	0.0	0.0
Other non-current liabilities	0.0	0.0
Non-current liabilities held for sale		0.0
Total liabilities	2,662.2	5,542.7
Equity
Total equity	5,109.4	4,471.7
Total liabilities and equity	7,771.6	10,014.4
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	113.3	238.5	126.2	110.3
Accounts and notes receivable, net	831.6	763.9
Inventories	581.0	524.2
Other current assets	239.3	237.8
Current assets held for sale		891.9
Total current assets	1,765.2	2,656.3
Property, plant and equipment, net	545.5	538.6
Other assets
Investments in subsidiaries	0.0	0.0
Goodwill	4,351.1	4,217.4
Intangibles, net	1,558.4	1,631.8
Other non-current assets	2,317.1	1,568.9
Non-current assets held for sale	(708.1)	2,292.9
Total other assets	7,518.5	9,711.0
Total assets	9,829.2	12,905.9
Current liabilities
Current maturities of long-term debt and short-term borrowings		0.8
Accounts payable	494.3	435.8
Employee compensation and benefits	186.2	165.3
Other current liabilities	438.2	379.2
Current liabilities held for sale		356.2
Total current liabilities	1,118.7	1,337.3
Other liabilities
Long-term debt	628.9	756.4
Pension and other post-retirement compensation and benefits	285.6	253.4
Deferred tax liabilities	394.8	609.5
Other non-current liabilities	244.9	148.2
Non-current liabilities held for sale		505.9
Total liabilities	2,672.9	3,610.7
Equity
Total equity	7,156.3	9,295.2
Total liabilities and equity	9,829.2	12,905.9
Eliminations
Current assets
Cash and cash equivalents	0.0	0.0	$ 0.0	$ 0.0
Accounts and notes receivable, net	0.0	0.0
Inventories	0.0	0.0
Other current assets	(30.5)	9.2
Current assets held for sale		0.0
Total current assets	(30.5)	9.2
Property, plant and equipment, net	0.0	0.0
Other assets
Investments in subsidiaries	(17,470.8)	(18,276.4)
Goodwill	0.0	0.0
Intangibles, net	0.0	0.0
Other non-current assets	(1,889.4)	(2,142.0)
Non-current assets held for sale	0.0	0.0
Total other assets	(19,360.2)	(20,418.4)
Total assets	(19,390.7)	(20,409.2)
Current liabilities
Current maturities of long-term debt and short-term borrowings		0.0
Accounts payable	0.0	0.0
Employee compensation and benefits	0.0	0.0
Other current liabilities	(30.5)	9.2
Current liabilities held for sale		0.0
Total current liabilities	(30.5)	9.2
Other liabilities
Long-term debt	(1,889.4)	(2,142.0)
Pension and other post-retirement compensation and benefits	0.0	0.0
Deferred tax liabilities	0.0	0.0
Other non-current liabilities	0.0	0.0
Non-current liabilities held for sale		0.0
Total liabilities	(1,919.9)	(2,132.8)
Equity
Total equity	(17,470.8)	(18,276.4)
Total liabilities and equity	$ (19,390.7)	$ (20,409.2)