Financial Statements of Parent Company Guarantor - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net cash provided by (used for) operating activities	$ (167.6)	$ (106.0)
Investing activities
Capital expenditures	(16.8)	(23.6)
Proceeds from sale of property and equipment	2.3	0.0
Payments due to the sale of businesses, net	(13.8)	0.0
Acquisitions, net of cash acquired	(2.9)	(56.7)
Intercompany Loan Activity, Net	0.0	0.0
Net cash provided by (used for) investing activities of continuing operations	(31.2)	(80.3)
Net cash provided by (used for) investing activities of discontinued operations	0.0	(3.7)
Net cash provided by (used for) investing activities	(31.2)	(84.0)
Financing activities
Net receipts of short-term borrowings	0.2	(0.1)
Net receipts of commercial paper and revolving long-term debt	417.5	229.1
Proceeds from long-term debt	800.0	0.0
Debt issuance costs	(7.5)	0.0
Net change in advances to subsidiaries	0.0	0.0
Shares issued to employees, net of shares withheld	0.9	2.8
Repurchases of ordinary shares	(150.0)	0.0
Dividends paid	(63.3)	(62.8)
Net cash provided by (used for) financing activities	997.8	169.0
Effect of exchange rate changes on cash and cash equivalents	(4.8)	20.6
Change in cash and cash equivalents	794.2	(0.4)
Cash and cash equivalents, beginning of period	113.3	238.5
Cash and cash equivalents, end of period	907.5	238.1
Parent Company Guarantor
Operating activities
Net cash provided by (used for) operating activities	83.4	49.8
Investing activities
Capital expenditures	0.0	0.0
Proceeds from sale of property and equipment	0.0
Payments due to the sale of businesses, net	0.0
Acquisitions, net of cash acquired	0.0	0.0
Intercompany Loan Activity, Net	0.0	0.0
Net cash provided by (used for) investing activities of continuing operations		0.0
Net cash provided by (used for) investing activities of discontinued operations		0.0
Net cash provided by (used for) investing activities	0.0	0.0
Financing activities
Net receipts of short-term borrowings	0.0	0.0
Net receipts of commercial paper and revolving long-term debt	0.0	0.0
Proceeds from long-term debt	0.0
Debt issuance costs	0.0
Net change in advances to subsidiaries	129.2	10.2
Shares issued to employees, net of shares withheld	0.9	2.8
Repurchases of ordinary shares	(150.0)
Dividends paid	(63.3)	(62.8)
Net cash provided by (used for) financing activities	(83.2)	(49.8)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Change in cash and cash equivalents	0.2	0.0
Cash and cash equivalents, beginning of period	0.0	0.0
Cash and cash equivalents, end of period	0.2	0.0
Guarantor Subsidiaries
Operating activities
Net cash provided by (used for) operating activities	111.3	75.1
Investing activities
Capital expenditures	0.0	0.0
Proceeds from sale of property and equipment	0.0
Payments due to the sale of businesses, net	0.0
Acquisitions, net of cash acquired	0.0	0.0
Intercompany Loan Activity, Net	(1.9)	0.0
Net cash provided by (used for) investing activities of continuing operations		0.0
Net cash provided by (used for) investing activities of discontinued operations		0.0
Net cash provided by (used for) investing activities	(1.9)	0.0
Financing activities
Net receipts of short-term borrowings	0.0	0.0
Net receipts of commercial paper and revolving long-term debt	0.0	0.0
Proceeds from long-term debt	0.0
Debt issuance costs	0.0
Net change in advances to subsidiaries	(109.4)	(75.1)
Shares issued to employees, net of shares withheld	0.0	0.0
Repurchases of ordinary shares	0.0
Dividends paid	0.0	0.0
Net cash provided by (used for) financing activities	(109.4)	(75.1)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Change in cash and cash equivalents	0.0	0.0
Cash and cash equivalents, beginning of period	0.0	0.0
Cash and cash equivalents, end of period	0.0	0.0
Subsidiary Issuer
Operating activities
Net cash provided by (used for) operating activities	109.1	69.5
Investing activities
Capital expenditures	0.0	0.0
Proceeds from sale of property and equipment	0.0
Payments due to the sale of businesses, net	0.0
Acquisitions, net of cash acquired	0.0	0.0
Intercompany Loan Activity, Net	(262.6)	(530.4)
Net cash provided by (used for) investing activities of continuing operations		(530.4)
Net cash provided by (used for) investing activities of discontinued operations		0.0
Net cash provided by (used for) investing activities	(262.6)	(530.4)
Financing activities
Net receipts of short-term borrowings	0.0	0.0
Net receipts of commercial paper and revolving long-term debt	223.8	234.0
Proceeds from long-term debt	0.0
Debt issuance costs	0.0
Net change in advances to subsidiaries	(91.4)	206.9
Shares issued to employees, net of shares withheld	0.0	0.0
Repurchases of ordinary shares	0.0
Dividends paid	0.0	0.0
Net cash provided by (used for) financing activities	132.4	440.9
Effect of exchange rate changes on cash and cash equivalents	21.1	20.1
Change in cash and cash equivalents	0.0	0.1
Cash and cash equivalents, beginning of period	0.0	0.0
Cash and cash equivalents, end of period	0.0	0.1
Non-Guarantor Subsidiaries
Operating activities
Net cash provided by (used for) operating activities	(129.7)	(41.0)
Investing activities
Capital expenditures	(16.8)	(23.6)
Proceeds from sale of property and equipment	2.3
Payments due to the sale of businesses, net	(13.8)
Acquisitions, net of cash acquired	(2.9)	(56.7)
Intercompany Loan Activity, Net	103.1	(290.2)
Net cash provided by (used for) investing activities of continuing operations		(370.5)
Net cash provided by (used for) investing activities of discontinued operations		(3.7)
Net cash provided by (used for) investing activities	71.9	(374.2)
Financing activities
Net receipts of short-term borrowings	0.2	(0.1)
Net receipts of commercial paper and revolving long-term debt	193.7	(4.9)
Proceeds from long-term debt	800.0
Debt issuance costs	(7.5)
Net change in advances to subsidiaries	(108.7)	419.2
Shares issued to employees, net of shares withheld	0.0	0.0
Repurchases of ordinary shares	0.0
Dividends paid	0.0	0.0
Net cash provided by (used for) financing activities	877.7	414.2
Effect of exchange rate changes on cash and cash equivalents	(25.9)	0.5
Change in cash and cash equivalents	794.0	(0.5)
Cash and cash equivalents, beginning of period	113.3	238.5
Cash and cash equivalents, end of period	907.3	238.0
Consolidation, Eliminations
Operating activities
Net cash provided by (used for) operating activities	(341.7)	(259.4)
Investing activities
Capital expenditures	0.0	0.0
Proceeds from sale of property and equipment	0.0
Payments due to the sale of businesses, net	0.0
Acquisitions, net of cash acquired	0.0	0.0
Intercompany Loan Activity, Net	161.4	820.6
Net cash provided by (used for) investing activities of continuing operations		820.6
Net cash provided by (used for) investing activities of discontinued operations		0.0
Net cash provided by (used for) investing activities	161.4	820.6
Financing activities
Net receipts of short-term borrowings	0.0	0.0
Net receipts of commercial paper and revolving long-term debt	0.0	0.0
Proceeds from long-term debt	0.0
Debt issuance costs	0.0
Net change in advances to subsidiaries	180.3	(561.2)
Shares issued to employees, net of shares withheld	0.0	0.0
Repurchases of ordinary shares	0.0
Dividends paid	0.0	0.0
Net cash provided by (used for) financing activities	180.3	(561.2)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Change in cash and cash equivalents	0.0	0.0
Cash and cash equivalents, beginning of period	0.0	0.0
Cash and cash equivalents, end of period	$ 0.0	$ 0.0