Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net cash used by operating activities	$ (79.9)	$ (57.1)
Cash flow from investing activities:
Capital expenditures	(5.4)	(14.7)
Proceeds from maturities of short-term investments	40.1	52.7
Payments for purchases of short-term investments	(44.5)	(48.3)
Proceeds from sale of assets		4.2
Increase in certain other assets	(3.4)	(5.4)
Capital contributions and loans paid	0.0	0.0
Proceeds from intercompany loans	0.0	0.0
Net cash used by investing activities	(51.7)	(11.5)
Cash flow from financing activities:
Revolving credit facility borrowings	385.9	10.0
Other debt borrowings	20.0	5.0
Other debt repayments	(83.1)	(16.8)
Distributions and payments to noncontrolling interest holders	0.0	(11.0)
Other	(5.0)	(1.1)
Capital contributions received and loans incurred	0.0	0.0
Payments on intercompany loans	0.0	0.0
Net cash provided by financing activities	314.0	(13.9)
Effect of exchange rate changes on cash and cash equivalents	(15.6)	(0.5)
Decrease in cash, cash equivalents and restricted cash	166.8	(83.0)
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	32.8	4.8
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	512.1	377.9
Payments of Debt Issuance Costs	3.8	0.0
Reportable Legal Entities [Member] | Parent Company [Member]
Net cash used by operating activities	10.8	15.3
Cash flow from investing activities:
Capital expenditures	(1.1)	(1.1)
Proceeds from maturities of short-term investments	0.0	2.0
Payments for purchases of short-term investments	0.0	0.0
Proceeds from sale of assets		0.0
Increase in certain other assets	(2.5)	(1.6)
Capital contributions and loans paid	(5.8)	(16.5)
Proceeds from intercompany loans	6.3	6.4
Net cash used by investing activities	(3.1)	(10.8)
Cash flow from financing activities:
Revolving credit facility borrowings	375.9	0.0
Other debt borrowings	6.0	0.0
Other debt repayments	(72.4)	(6.6)
Distributions and payments to noncontrolling interest holders		0.0
Other	(4.6)	(1.1)
Capital contributions received and loans incurred	0.0	0.0
Payments on intercompany loans	0.0	0.0
Net cash provided by financing activities	301.1	(7.7)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Decrease in cash, cash equivalents and restricted cash	308.8	(3.2)
Add: Cash included in assets held for sale at beginning of period	0.0
Less: Cash included in assets held for sale at end of period	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	312.4	14.1
Payments of Debt Issuance Costs	3.8
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net cash used by operating activities	(7.7)	(12.5)
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	3.5	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	3.5	0.0
Cash flow from financing activities:
Revolving credit facility borrowings	0.0	0.0
Other debt borrowings	0.0	0.0
Other debt repayments	0.0	0.0
Distributions and payments to noncontrolling interest holders		0.0
Other	0.0	0.0
Capital contributions received and loans incurred	5.8	16.1
Payments on intercompany loans	(0.7)	(3.3)
Net cash provided by financing activities	5.1	12.8
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Decrease in cash, cash equivalents and restricted cash	0.9	0.3
Add: Cash included in assets held for sale at beginning of period	0.0
Less: Cash included in assets held for sale at end of period	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	2.7	3.0
Payments of Debt Issuance Costs	0.0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net cash used by operating activities	(83.0)	(59.9)
Cash flow from investing activities:
Capital expenditures	(4.3)	(13.6)
Proceeds from maturities of short-term investments	40.1	50.7
Payments for purchases of short-term investments	(44.5)	(48.3)
Proceeds from sale of assets		4.2
Increase in certain other assets	(4.4)	(3.8)
Capital contributions and loans paid	0.0	0.0
Proceeds from intercompany loans	0.0	0.0
Net cash used by investing activities	(51.6)	(10.8)
Cash flow from financing activities:
Revolving credit facility borrowings	10.0	10.0
Other debt borrowings	14.0	5.0
Other debt repayments	(10.7)	(10.2)
Distributions and payments to noncontrolling interest holders		(11.0)
Other	(0.4)	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	7.3	(8.9)
Effect of exchange rate changes on cash and cash equivalents	(15.6)	(0.5)
Decrease in cash, cash equivalents and restricted cash	(142.9)	(80.1)
Add: Cash included in assets held for sale at beginning of period	97.2
Less: Cash included in assets held for sale at end of period	32.8
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	197.0	360.8
Payments of Debt Issuance Costs	0.0
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	5.8	16.5
Proceeds from intercompany loans	(6.3)	(6.4)
Net cash used by investing activities	(0.5)	10.1
Cash flow from financing activities:
Revolving credit facility borrowings	0.0	0.0
Other debt borrowings	0.0	0.0
Other debt repayments	0.0	0.0
Distributions and payments to noncontrolling interest holders		0.0
Other	0.0	0.0
Capital contributions received and loans incurred	(5.8)	(16.5)
Payments on intercompany loans	6.3	6.4
Net cash provided by financing activities	0.5	(10.1)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
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
Less: Cash included in assets held for sale at end of period	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