Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net cash provided by operating activities	$ 37.1	$ 28.7	$ 37.2
Payments for acquisitions, net of cash acquired	(5.6)	(884.6)	(59.4)
Proceeds from maturities of investments	296.2	225.0	176.1
Proceeds from sale of investments	0.0	0.0
Payments for purchases of investments	(329.8)	(243.5)	(125.5)
Proceeds from divestitures and the sale of assets	20.9	31.3	5.0
Capital expenditures	(69.4)	(39.5)	(52.3)
Increase (decrease) in certain other assets	(41.1)	(28.2)	(6.3)
Proceeds from sale of foreign currency option and forward contracts, net	0.0	(16.2)	0.0
Capital contributions and loans paid	0.0	0.0	0.0
Proceeds from intercompany loans	0.0	0.0	0.0
Net cash provided (used) by investing activities - continuing operations	(128.8)	(923.3)	(62.4)
Net cash provided (used) by investing activities - discontinued operations	0.0	361.9	(2.5)
Net cash provided (used) by investing activities	(128.8)	(561.4)	(64.9)
Dividends paid	(30.6)	(64.6)	(75.6)
Debt issuance costs	(1.1)	(39.2)	(6.0)
Revolving debt borrowings (repayments), net	75.0	(178.0)	155.8
Other debt borrowings	374.1	1,837.7	135.8
Other debt repayments	(458.8)	(662.5)	(168.7)
Distributions to noncontrolling interest holders	(17.6)	(10.2)	(0.1)
Issuance of common shares	0.3	0.3	3.5
Repurchase of common shares	(5.0)	(2.2)	(3.0)
Capital contributions received and loans incurred	0.0	0.0	0.0
Payments on intercompany loans	0.0	0.0	0.0
Net cash provided (used) by financing activities	(63.7)	881.3	41.7
Effect of exchange rate changes on cash	37.9	(8.0)	(23.9)
Increase (decrease) in cash and cash equivalents	(117.5)	340.6	(9.9)
Add: Cash overdraft included in assets held for sale at beginning of year	0.0	(1.5)	(4.1)
Less: Cash overdraft included in assets held for sale at end of year	0.0	0.0	(1.5)
Cash and cash equivalents at the beginning of the year	652.7	313.6	326.1
Cash and cash equivalents at the end of the year	535.2	652.7	313.6
Parent Company [Member]
Net cash provided by operating activities	(43.9)	(146.4)	1.6
Payments for acquisitions, net of cash acquired	0.0	(995.2)	0.0
Proceeds from maturities of investments	0.0	(1.9)	(2.1)
Payments for purchases of investments	(14.0)	0.0	0.0
Proceeds from divestitures and the sale of assets	4.6	0.0	0.0
Capital expenditures	(13.0)	(9.2)	(34.9)
Increase (decrease) in certain other assets	(43.0)	0.5	(6.5)
Proceeds from sale of foreign currency option and forward contracts, net		16.2
Capital contributions and loans paid	(114.5)	(270.2)	(205.4)
Proceeds from intercompany loans	210.7	106.4	173.0
Net cash provided (used) by investing activities - continuing operations		(1,153.4)	(75.9)
Net cash provided (used) by investing activities - discontinued operations		361.9	(2.5)
Net cash provided (used) by investing activities	30.8	(791.5)	(78.4)
Dividends paid	(30.6)	(64.6)	(75.6)
Debt issuance costs	(1.1)	(39.2)	(6.0)
Revolving debt borrowings (repayments), net	0.0	(178.0)	180.8
Other debt borrowings	323.3	1,781.3	0.0
Other debt repayments	(354.2)	(439.6)	(14.8)
Distributions to noncontrolling interest holders	0.0	0.0	0.1
Issuance of common shares	0.3	0.3	3.5
Repurchase of common shares	(5.0)	(2.2)	(3.0)
Capital contributions received and loans incurred	0.0	0.0	0.0
Payments on intercompany loans	0.0	0.0	0.0
Net cash provided (used) by financing activities	(67.3)	1,058.0	85.0
Effect of exchange rate changes on cash	0.0	0.0	0.0
Increase (decrease) in cash and cash equivalents	(80.4)	120.1	8.2
Add: Cash overdraft included in assets held for sale at beginning of year	0.0	(1.5)	(4.1)
Less: Cash overdraft included in assets held for sale at end of year		0.0	(1.5)
Cash and cash equivalents at the beginning of the year	138.9	20.3	14.7
Cash and cash equivalents at the end of the year	58.5	138.9	20.3
Guarantor Subsidiaries [Member]
Net cash provided by operating activities	(41.6)	(43.2)	(26.2)
Payments for acquisitions, net of cash acquired	0.0	0.0	0.0
Proceeds from maturities of investments	0.0	0.0	0.0
Payments for purchases of investments	0.0	0.0	0.0
Proceeds from divestitures and the sale of assets	0.0	0.0	3.5
Capital expenditures	(0.1)	(1.0)	(5.9)
Increase (decrease) in certain other assets	11.8	(6.8)	(6.6)
Proceeds from sale of foreign currency option and forward contracts, net		0.0
Capital contributions and loans paid	0.0	0.0	0.0
Proceeds from intercompany loans	0.0	0.0	0.0
Net cash provided (used) by investing activities - continuing operations		(7.8)	(9.0)
Net cash provided (used) by investing activities - discontinued operations		0.0	0.0
Net cash provided (used) by investing activities	11.7	(7.8)	(9.0)
Dividends paid	0.0	0.0	0.0
Debt issuance costs	0.0	0.0	0.0
Revolving debt borrowings (repayments), net	0.0	0.0	0.0
Other debt borrowings	0.0	0.0	0.0
Other debt repayments	(1.2)	(1.2)	(0.8)
Distributions to noncontrolling interest holders	0.0	0.0	0.0
Issuance of common shares	0.0	0.0	0.0
Repurchase of common shares	0.0	0.0	0.0
Capital contributions received and loans incurred	67.1	133.3	179.3
Payments on intercompany loans	(36.0)	(86.7)	(137.9)
Net cash provided (used) by financing activities	29.9	45.4	40.6
Effect of exchange rate changes on cash	0.0	0.0	0.0
Increase (decrease) in cash and cash equivalents	0.0	(5.6)	5.4
Add: Cash overdraft included in assets held for sale at beginning of year	0.0	0.0	0.0
Less: Cash overdraft included in assets held for sale at end of year		0.0	0.0
Cash and cash equivalents at the beginning of the year	2.3	7.9	2.5
Cash and cash equivalents at the end of the year	2.3	2.3	7.9
Non-Guarantor Subsidiaries [Member]
Net cash provided by operating activities	122.6	232.1	97.5
Payments for acquisitions, net of cash acquired	(5.6)	110.6	(59.4)
Proceeds from maturities of investments	296.2	226.9	178.2
Payments for purchases of investments	(315.8)	(243.5)	(125.5)
Proceeds from divestitures and the sale of assets	16.3	31.3	1.5
Capital expenditures	(56.3)	(29.3)	(11.5)
Increase (decrease) in certain other assets	(9.9)	(21.9)	6.8
Proceeds from sale of foreign currency option and forward contracts, net		0.0
Capital contributions and loans paid	0.0	(1,119.3)	(3.8)
Proceeds from intercompany loans	0.0	0.0	0.0
Net cash provided (used) by investing activities - continuing operations		(1,045.2)	(13.7)
Net cash provided (used) by investing activities - discontinued operations		0.0	0.0
Net cash provided (used) by investing activities	(75.1)	(1,045.2)	(13.7)
Dividends paid	0.0	(13.8)	(35.7)
Debt issuance costs	0.0	0.0	0.0
Revolving debt borrowings (repayments), net	75.0	0.0	(25.0)
Other debt borrowings	50.8	56.4	135.8
Other debt repayments	(103.4)	(221.7)	(153.1)
Distributions to noncontrolling interest holders	(17.6)	(10.2)	(0.2)
Issuance of common shares	0.0	0.0	0.0
Repurchase of common shares	0.0	0.0	0.0
Capital contributions received and loans incurred	47.4	1,256.2	29.9
Payments on intercompany loans	(174.7)	(19.7)	(35.1)
Net cash provided (used) by financing activities	(122.5)	1,047.2	(83.4)
Effect of exchange rate changes on cash	37.9	(8.0)	(23.9)
Increase (decrease) in cash and cash equivalents	(37.1)	226.1	(23.5)
Add: Cash overdraft included in assets held for sale at beginning of year	0.0	0.0	0.0
Less: Cash overdraft included in assets held for sale at end of year		0.0	0.0
Cash and cash equivalents at the beginning of the year	511.5	285.4	308.9
Cash and cash equivalents at the end of the year	474.4	511.5	285.4
Reclassifications And Eliminations [Member]
Net cash provided by operating activities	0.0	(13.8)	(35.7)
Payments for acquisitions, net of cash acquired	0.0	0.0	0.0
Proceeds from maturities of investments	0.0	0.0	0.0
Payments for purchases of investments	0.0	0.0	0.0
Proceeds from divestitures and the sale of assets	0.0	0.0	0.0
Capital expenditures	0.0	0.0	0.0
Increase (decrease) in certain other assets	0.0	0.0	0.0
Proceeds from sale of foreign currency option and forward contracts, net		0.0
Capital contributions and loans paid	114.5	1,389.5	209.2
Proceeds from intercompany loans	(210.7)	(106.4)	(173.0)
Net cash provided (used) by investing activities - continuing operations		1,283.1	36.2
Net cash provided (used) by investing activities - discontinued operations		0.0	0.0
Net cash provided (used) by investing activities	(96.2)	1,283.1	36.2
Dividends paid	0.0	13.8	35.7
Debt issuance costs	0.0	0.0	0.0
Revolving debt borrowings (repayments), net	0.0	0.0	0.0
Other debt borrowings	0.0	0.0	0.0
Other debt repayments	0.0	0.0	0.0
Distributions to noncontrolling interest holders	0.0	0.0	0.0
Issuance of common shares	0.0	0.0	0.0
Repurchase of common shares	0.0	0.0	0.0
Capital contributions received and loans incurred	(114.5)	(1,389.5)	(209.2)
Payments on intercompany loans	210.7	106.4	173.0
Net cash provided (used) by financing activities	96.2	(1,269.3)	(0.5)
Effect of exchange rate changes on cash	0.0	0.0	0.0
Increase (decrease) in cash and cash equivalents	0.0	0.0	0.0
Add: Cash overdraft included in assets held for sale at beginning of year	0.0	0.0	0.0
Less: Cash overdraft included in assets held for sale at end of year		0.0	0.0
Cash and cash equivalents at the beginning of the year	0.0	0.0	0.0
Cash and cash equivalents at the end of the year	$ 0.0	$ 0.0	$ 0.0