Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net cash used by operating activities	$ (170.6)	$ (67.6)
Cash flow from investing activities:
Capital expenditures	(8.8)	(20.3)
Proceeds from maturities of short-term investments	104.1	108.2
Payments for purchases of short-term investments	(103.0)	(85.8)
Proceeds from sale of assets		8.2
Increase in certain other assets	1.2	11.8
Capital contributions and loans paid	0.0	0.0
Proceeds from intercompany loans	0.0	0.0
Net cash used by investing activities	(54.4)	(1.5)
Cash flow from financing activities:
Revolving credit facility borrowings (repayments), net	385.9	(10.0)
Other debt borrowings	20.0	19.6
Other debt repayments	(90.5)	(42.9)
Distributions to noncontrolling interest holders	0.0	(98.0)
Other	(5.5)	(1.6)
Capital contributions received and loans incurred	0.0	0.0
Payments on intercompany loans	0.0	0.0
Net cash provided by financing activities	306.1	(132.9)
Effect of exchange rate changes on cash and cash equivalents	(10.8)	0.2
Increase (decrease) in cash, cash equivalents and restricted cash	70.3	(201.8)
Add: Cash included in assets held for sale at beginning of period	97.2	7.3
Less: Cash included in assets held for sale at end of period	2.0	4.1
Cash, cash equivalents and restricted cash at the beginning of the period	280.9	458.4
Cash, cash equivalents and restricted cash at the end of the period	446.4	259.8
Payments of Debt Issuance Costs	3.8	0.0
Proceeds from divestitures, net of cash divested	(47.9)	8.2
Reportable Legal Entities [Member] | Parent Company [Member]
Net cash used by operating activities	(118.8)	54.7
Cash flow from investing activities:
Capital expenditures	(2.1)	(2.2)
Proceeds from maturities of short-term investments	0.0	1.2
Payments for purchases of short-term investments	0.0	0.0
Proceeds from sale of assets		0.1
Increase in certain other assets	(9.9)	3.4
Capital contributions and loans paid	(12.1)	(27.4)
Proceeds from intercompany loans	9.4	9.9
Net cash used by investing activities	5.1	(21.8)
Cash flow from financing activities:
Revolving credit facility borrowings (repayments), net	385.9	(25.0)
Other debt borrowings	0.0	0.0
Other debt repayments	(72.8)	(13.6)
Distributions to noncontrolling interest holders		0.0
Other	(4.7)	(1.6)
Capital contributions received and loans incurred	0.0	0.0
Payments on intercompany loans	0.0	0.0
Net cash provided by financing activities	304.6	(40.2)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Increase (decrease) in cash, cash equivalents and restricted cash	190.9	(7.3)
Add: Cash included in assets held for sale at beginning of period	0.0	0.0
Less: Cash included in assets held for sale at end of period	0.0	0.0
Cash, cash equivalents and restricted cash at the beginning of the period	3.6	17.3
Cash, cash equivalents and restricted cash at the end of the period	194.5	10.0
Payments of Debt Issuance Costs	3.8
Proceeds from divestitures, net of cash divested	0.0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net cash used by operating activities	(10.1)	(21.0)
Cash flow from investing activities:
Capital expenditures	0.0	0.0
Proceeds from maturities of short-term investments	0.0	0.0
Payments for purchases of short-term investments	0.0	0.0
Proceeds from sale of assets		0.0
Increase in certain other assets	0.0	0.0
Capital contributions and loans paid	0.0	0.0
Proceeds from intercompany loans	0.0	0.0
Net cash used by investing activities	0.0	0.0
Cash flow from financing activities:
Revolving credit facility borrowings (repayments), net	0.0	0.0
Other debt borrowings	0.0	0.0
Other debt repayments	0.0	0.0
Distributions to noncontrolling interest holders		0.0
Other	0.0	0.0
Capital contributions received and loans incurred	12.1	27.0
Payments on intercompany loans	(3.8)	(6.8)
Net cash provided by financing activities	8.3	20.2
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Increase (decrease) in cash, cash equivalents and restricted cash	(1.8)	(0.8)
Add: Cash included in assets held for sale at beginning of period	0.0	0.0
Less: Cash included in assets held for sale at end of period	0.0	0.0
Cash, cash equivalents and restricted cash at the beginning of the period	1.8	2.7
Cash, cash equivalents and restricted cash at the end of the period	0.0	1.9
Payments of Debt Issuance Costs	0.0
Proceeds from divestitures, net of cash divested	0.0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net cash used by operating activities	(41.7)	(101.3)
Cash flow from investing activities:
Capital expenditures	(6.7)	(18.1)
Proceeds from maturities of short-term investments	104.1	107.0
Payments for purchases of short-term investments	(103.0)	(85.8)
Proceeds from sale of assets		8.1
Increase in certain other assets	8.7	8.4
Capital contributions and loans paid	0.0	0.0
Proceeds from intercompany loans	0.0	0.0
Net cash used by investing activities	(62.2)	2.8
Cash flow from financing activities:
Revolving credit facility borrowings (repayments), net	0.0	15.0
Other debt borrowings	20.0	19.6
Other debt repayments	(17.7)	(29.3)
Distributions to noncontrolling interest holders		(98.0)
Other	(0.8)	0.0
Capital contributions received and loans incurred	0.0	0.4
Payments on intercompany loans	(5.6)	(3.1)
Net cash provided by financing activities	(4.1)	(95.4)
Effect of exchange rate changes on cash and cash equivalents	(10.8)	0.2
Increase (decrease) in cash, cash equivalents and restricted cash	(118.8)	(193.7)
Add: Cash included in assets held for sale at beginning of period	97.2	7.3
Less: Cash included in assets held for sale at end of period	2.0	4.1
Cash, cash equivalents and restricted cash at the beginning of the period	275.5	438.4
Cash, cash equivalents and restricted cash at the end of the period	251.9	247.9
Payments of Debt Issuance Costs	0.0
Proceeds from divestitures, net of cash divested	47.9
Consolidation, Eliminations [Member]
Net cash used by operating activities	0.0	0.0
Cash flow from investing activities:
Capital expenditures	0.0	0.0
Proceeds from maturities of short-term investments	0.0	0.0
Payments for purchases of short-term investments	0.0	0.0
Proceeds from sale of assets		0.0
Increase in certain other assets	0.0	0.0
Capital contributions and loans paid	12.1	27.4
Proceeds from intercompany loans	(9.4)	(9.9)
Net cash used by investing activities	2.7	17.5
Cash flow from financing activities:
Revolving credit facility borrowings (repayments), net	0.0	0.0
Other debt borrowings	0.0	0.0
Other debt repayments	0.0	0.0
Distributions to noncontrolling interest holders		0.0
Other	0.0	0.0
Capital contributions received and loans incurred	(12.1)	(27.4)
Payments on intercompany loans	9.4	9.9
Net cash provided by financing activities	(2.7)	(17.5)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Increase (decrease) in cash, cash equivalents and restricted cash	0.0	0.0
Add: Cash included in assets held for sale at beginning of period	0.0	0.0
Less: Cash included in assets held for sale at end of period	0.0	0.0
Cash, cash equivalents and restricted cash at the beginning of the period	0.0	0.0
Cash, cash equivalents and restricted cash at the end of the period	0.0	$ 0.0
Payments of Debt Issuance Costs	0.0
Proceeds from divestitures, net of cash divested	$ 0.0