Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net cash provided by operating activities	$ 135.8	$ (104.1)	$ 37.1
Capital expenditures	(42.9)	(58.5)	(69.4)
Payments for acquisitions, net of cash acquired	0.0	(5.9)	(5.6)
Proceeds from maturities of investments	241.7	317.8	296.2
Payments for purchases of investments	(222.2)	(200.2)	(329.8)
Proceeds from divestitures and the sale of assets	29.9	11.1	20.9
Increase (decrease) in certain other assets	(13.3)	(29.9)	(33.1)
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	(6.8)	34.4	(120.8)
Dividends paid	0.0	(7.7)	(30.6)
Debt issuance costs	(12.6)	(39.4)	(1.1)
Revolving debt (repayments) borrowings, net	(125.0)	50.0	75.0
Other debt borrowings	397.8	725.9	374.1
Other debt repayments	(375.7)	(337.7)	(458.8)
Distributions to noncontrolling interest holders	(98.1)	(377.2)	(17.6)
Issuance of common shares	0.0	0.0	0.3
Other	(1.9)	(3.0)	(5.0)
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	(215.5)	10.9	(63.7)
Effect of exchange rate changes on cash	(1.1)	(18.7)	37.9
Decrease in cash, cash equivalents and restricted cash	(87.6)	(77.5)	(109.5)
Add: Cash included in assets held for sale at beginning of year	7.3	0.0	0.0
Less: Cash included in assets held for sale at end of year	97.2	7.3	0.0
Cash, cash equivalents and restricted cash at the beginning of the year	458.4	543.2	652.7
Cash, cash equivalents and restricted cash at the end of the year	280.9	458.4	543.2
Parent Company [Member]
Add: Cash included in assets held for sale at beginning of year	0.0
Less: Cash included in assets held for sale at end of year		0.0
Guarantor Subsidiaries [Member]
Add: Cash included in assets held for sale at beginning of year	0.0
Less: Cash included in assets held for sale at end of year		0.0
Non-Guarantor Subsidiaries [Member]
Add: Cash included in assets held for sale at beginning of year	7.3
Less: Cash included in assets held for sale at end of year		7.3
Reportable Legal Entities [Member] | Parent Company [Member]
Net cash provided by operating activities	97.6	(67.8)	(43.9)
Capital expenditures	(5.3)	(6.5)	(13.0)
Payments for acquisitions, net of cash acquired		0.0	0.0
Proceeds from maturities of investments	0.0	71.2	0.0
Payments for purchases of investments	0.0	0.0	(14.0)
Proceeds from divestitures and the sale of assets	21.4	6.7	4.6
Increase (decrease) in certain other assets	(9.8)	(5.8)	(43.0)
Capital contributions and loans paid	(47.0)	(503.2)	(114.5)
Proceeds from intercompany loans	13.1	29.2	210.7
Net cash provided (used) by investing activities	(27.6)	(408.4)	30.8
Dividends paid		(7.7)	(30.6)
Debt issuance costs	(12.6)	(39.4)	(1.1)
Revolving debt (repayments) borrowings, net	(110.0)	110.0	0.0
Other debt borrowings	374.3	660.0	323.3
Other debt repayments	(333.9)	(284.9)	(354.2)
Distributions to noncontrolling interest holders	0.0	0.0	0.0
Issuance of common shares			0.3
Other	(1.5)	(3.0)	(5.0)
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	(83.7)	435.0	(67.3)
Effect of exchange rate changes on cash	0.0	0.0	0.0
Decrease in cash, cash equivalents and restricted cash	(13.7)	(41.2)	(80.4)
Add: Cash included in assets held for sale at beginning of year	0.0
Less: Cash included in assets held for sale at end of year	0.0	0.0
Cash, cash equivalents and restricted cash at the beginning of the year	17.3	58.5	138.9
Cash, cash equivalents and restricted cash at the end of the year	3.6	17.3	58.5
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net cash provided by operating activities	(37.3)	(37.7)	(41.6)
Capital expenditures	0.0	(0.1)	(0.1)
Payments for acquisitions, net of cash acquired		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
Increase (decrease) in certain other assets	0.0	0.0	11.8
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	0.0	(0.1)	11.7
Dividends paid		0.0	0.0
Debt issuance costs	0.0	0.0	0.0
Revolving debt (repayments) borrowings, net	0.0	0.0	0.0
Other debt borrowings	0.0	0.0	0.0
Other debt repayments	(0.1)	(0.3)	(1.2)
Distributions to noncontrolling interest holders	0.0	0.0	0.0
Issuance of common shares			0.0
Other	0.0	0.0	0.0
Capital contributions received and loans incurred	46.5	59.0	67.1
Payments on intercompany loans	(10.0)	(20.5)	(36.0)
Net cash provided (used) by financing activities	36.4	38.2	29.9
Effect of exchange rate changes on cash	0.0	0.0	0.0
Decrease in cash, cash equivalents and restricted cash	(0.9)	0.4	0.0
Add: Cash included in assets held for sale at beginning of year	0.0
Less: Cash included in assets held for sale at end of year	0.0	0.0
Cash, cash equivalents and restricted cash at the beginning of the year	2.7	2.3	2.3
Cash, cash equivalents and restricted cash at the end of the year	1.8	2.7	2.3
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net cash provided by operating activities	75.5	1.4	122.6
Capital expenditures	(37.6)	(51.9)	(56.3)
Payments for acquisitions, net of cash acquired		(5.9)	(5.6)
Proceeds from maturities of investments	241.7	246.6	296.2
Payments for purchases of investments	(222.2)	(200.2)	(315.8)
Proceeds from divestitures and the sale of assets	8.5	4.4	16.3
Increase (decrease) in certain other assets	(3.5)	(24.1)	(1.9)
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	(13.1)	(31.1)	(67.1)
Dividends paid		0.0	0.0
Debt issuance costs	0.0	0.0	0.0
Revolving debt (repayments) borrowings, net	(15.0)	(60.0)	75.0
Other debt borrowings	23.5	65.9	50.8
Other debt repayments	(41.7)	(52.5)	(103.4)
Distributions to noncontrolling interest holders	(98.1)	(377.2)	(17.6)
Issuance of common shares			0.0
Other	(0.4)	0.0	0.0
Capital contributions received and loans incurred	0.5	444.2	47.4
Payments on intercompany loans	(3.1)	(8.7)	(174.7)
Net cash provided (used) by financing activities	(134.3)	11.7	(122.5)
Effect of exchange rate changes on cash	(1.1)	(18.7)	37.9
Decrease in cash, cash equivalents and restricted cash	(73.0)	(36.7)	(29.1)
Add: Cash included in assets held for sale at beginning of year	7.3
Less: Cash included in assets held for sale at end of year	97.2	7.3
Cash, cash equivalents and restricted cash at the beginning of the year	438.4	482.4	511.5
Cash, cash equivalents and restricted cash at the end of the year	275.5	438.4	482.4
Consolidation, Eliminations [Member]
Net cash provided by operating activities	0.0	0.0	0.0
Capital expenditures	0.0	0.0	0.0
Payments for acquisitions, net of cash acquired		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
Increase (decrease) in certain other assets	0.0	0.0	0.0
Capital contributions and loans paid	47.0	503.2	114.5
Proceeds from intercompany loans	(13.1)	(29.2)	(210.7)
Net cash provided (used) by investing activities	33.9	474.0	(96.2)
Dividends paid		0.0	0.0
Debt issuance costs	0.0	0.0	0.0
Revolving debt (repayments) borrowings, 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
Other	0.0	0.0	0.0
Capital contributions received and loans incurred	(47.0)	(503.2)	(114.5)
Payments on intercompany loans	13.1	29.2	210.7
Net cash provided (used) by financing activities	(33.9)	(474.0)	96.2
Effect of exchange rate changes on cash	0.0	0.0	0.0
Decrease in cash, cash equivalents and restricted cash	0.0	0.0	0.0
Add: Cash included in assets held for sale at beginning of year	0.0
Less: Cash included in assets held for sale at end of year	0.0	0.0
Cash, cash equivalents and restricted cash at the beginning of the year	0.0	0.0	0.0
Cash, cash equivalents and restricted cash at the end of the year	$ 0.0	$ 0.0	$ 0.0