Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 1,829.4	$ 1,780.5
Less: Current portion of long-term debt	10.3	9.1
Total long-term debt	1,819.1	1,771.4
Restricted cash (included in “Prepaid expenses and other current assets”)	5.7		$ 3.5
Zhenjiang term loans
Debt Instrument [Line Items]
Restricted cash (included in “Prepaid expenses and other current assets”)	5.7	5.6
Line of Credit | ABL Facility
Debt Instrument [Line Items]
Total debt	365.9	319.3
Senior Notes | 7 7/8% Senior Notes
Debt Instrument [Line Items]
Total debt	437.0	436.7
Debt discount (premium) and deferred issuance costs	$ 3.1	3.3
Stated interest rate	7.875%
Senior Notes | 9 1/2% Senior Notes
Debt Instrument [Line Items]
Total debt	$ 800.7	800.8
Debt discount (premium) and deferred issuance costs	$ 0.7	0.8
Stated interest rate	9.50%
Senior Subordinated Notes | Senior Subordinated Exchangeable Notes
Debt Instrument [Line Items]
Total debt	$ 44.5	44.5
Debt discount	0.3	0.3
Notes Payable to Banks | Zhenjiang term loans
Debt Instrument [Line Items]
Total debt	172.1	169.8
Debt discount	0.5	0.5
Other Long-term Debt
Debt Instrument [Line Items]
Total debt	$ 9.2	$ 9.4