Separate Financial Information of Guarantor Subsidiaries Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities	$ 71.9	$ 80.0	$ 54.2
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment	(38.4)	(18.8)	(20.4)
Proceeds from Disposals of Property, Plant and Equipment	0.1	0.1	2.5
Proceeds from Principal Payments Received on Long-Term Note Receivable	2.9	1.4	0.7
Proceeds from Sale of Business	0.0	4.0	0.0
Acquisitions of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired	(19.7)	0.0	(354.1)
Payments to Acquire Notes Receivable			(1.5)
Purchases of Intangible Asset	(0.5)	(2.8)	(2.5)
Change in Investments in Subsidiaries		0.0	0.0
Loan Proceeds Received by the Parent from Subsidiaries		0.0
Loan Payments from Parent to Subsidiaries	0.0	0.0
Net Cash Used in Investing Activities	(55.6)	(16.1)	(375.3)
FINANCING ACTIVITIES
Proceeds from Debt	25.0	14.9	743.0
Loan Payments to Subsidiaries from the Parent	0.0	0.0	0.0
Loan Payments to Parents from Subsidiaries		0.0	0.0
Change in Subsidiary Equity		0.0	0.0
Repayments of Debt	(41.8)	(38.3)	(399.3)
Change in Finance Lease Obligation	(0.2)	0.0	0.3
Payments of Debt Issuance Costs	0.0	0.0	(16.5)
Proceeds from Issuance of Common Stock	6.1	5.9	6.9
Purchase of Noncontrolling Owner Interest	(0.5)	0.0	0.0
Dividends Paid	(16.0)	(15.3)	(15.0)
Net Cash (Used in) Provided by Financing Activities	(27.4)	(32.8)	319.4
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(0.4)	(4.0)	2.2
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(11.5)	27.1	0.5
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	86.1	59.0	58.5
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR	74.6	86.1	59.0
Parent Company
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities	54.2	68.1	27.0
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment	(27.5)	(6.8)	(9.5)
Proceeds from Disposals of Property, Plant and Equipment	0.1	0.0	0.0
Proceeds from Principal Payments Received on Long-Term Note Receivable	0.0	0.0	0.0
Proceeds from Sale of Business		0.0
Acquisitions of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired	0.0		(0.3)
Payments to Acquire Notes Receivable			0.0
Purchases of Intangible Asset	0.0	(2.5)	(2.5)
Change in Investments in Subsidiaries		(15.6)	(199.0)
Loan Proceeds Received by the Parent from Subsidiaries		1.2
Loan Payments from Parent to Subsidiaries	0.0	0.0
Net Cash Used in Investing Activities	(27.4)	(23.7)	(371.1)
FINANCING ACTIVITIES
Proceeds from Debt	25.0	11.0	743.0
Loan Payments to Subsidiaries from the Parent	(1.1)	(1.8)	5.0
Loan Payments to Parents from Subsidiaries		0.0	(159.8)
Change in Subsidiary Equity		0.0
Repayments of Debt	(37.7)	(38.0)	(399.2)
Change in Finance Lease Obligation	0.0		0.0
Payments of Debt Issuance Costs			(16.5)
Proceeds from Issuance of Common Stock	6.1	5.9	6.9
Purchase of Noncontrolling Owner Interest	0.0
Dividends Paid	(16.0)	(15.3)	(15.0)
Net Cash (Used in) Provided by Financing Activities	(23.7)	(38.2)	324.2
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(0.2)	0.2	(0.1)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	2.9	6.4	(20.0)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	24.8	18.4	38.4
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR	27.7	24.8	18.4
Guarantor Subsidiaries
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities	0.1	1.2	0.3
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment	(0.4)	(0.1)	0.0
Proceeds from Disposals of Property, Plant and Equipment	0.0	0.0	0.0
Proceeds from Principal Payments Received on Long-Term Note Receivable	0.0	0.0	0.0
Proceeds from Sale of Business		0.0
Acquisitions of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired	0.0		0.0
Payments to Acquire Notes Receivable			0.0
Purchases of Intangible Asset	0.0	0.0	0.0
Change in Investments in Subsidiaries		0.0	0.0
Loan Proceeds Received by the Parent from Subsidiaries		0.0
Loan Payments from Parent to Subsidiaries	0.0	0.0
Net Cash Used in Investing Activities	(0.4)	(0.1)	0.0
FINANCING ACTIVITIES
Proceeds from Debt	0.0	0.0	0.0
Loan Payments to Subsidiaries from the Parent	0.0	0.0	0.0
Loan Payments to Parents from Subsidiaries		0.0	0.0
Change in Subsidiary Equity		0.0	0.0
Repayments of Debt	0.0	0.0	0.0
Change in Finance Lease Obligation	0.0		0.0
Payments of Debt Issuance Costs			0.0
Proceeds from Issuance of Common Stock	0.0	0.0	0.0
Purchase of Noncontrolling Owner Interest	0.0
Dividends Paid	0.0	0.0	0.0
Net Cash (Used in) Provided by Financing Activities	0.0	0.0	0.0
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0.0	0.0	0.0
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(0.3)	1.1	0.3
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	1.6	0.5	0.2
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR	1.3	1.6	0.5
Non-Guarantor Subsidiaries
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities	17.6	10.9	27.7
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment	(10.5)	(11.9)	(10.9)
Proceeds from Disposals of Property, Plant and Equipment	0.0	0.1	2.5
Proceeds from Principal Payments Received on Long-Term Note Receivable	2.9	1.4	0.7
Proceeds from Sale of Business		4.0
Acquisitions of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired	(19.7)		(353.8)
Payments to Acquire Notes Receivable			(1.5)
Purchases of Intangible Asset	(0.5)	(0.3)	0.0
Change in Investments in Subsidiaries		0.0	0.0
Loan Proceeds Received by the Parent from Subsidiaries		0.0
Loan Payments from Parent to Subsidiaries	1.1	1.8
Net Cash Used in Investing Activities	(26.7)	(4.9)	(368.0)
FINANCING ACTIVITIES
Proceeds from Debt	0.0	3.9	0.0
Loan Payments to Subsidiaries from the Parent	0.0	0.0	159.8
Loan Payments to Parents from Subsidiaries		(1.2)	(5.0)
Change in Subsidiary Equity		15.6	199.0
Repayments of Debt	(4.1)	(0.3)	(0.1)
Change in Finance Lease Obligation	(0.2)		0.3
Payments of Debt Issuance Costs			0.0
Proceeds from Issuance of Common Stock	0.0	0.0	0.0
Purchase of Noncontrolling Owner Interest	(0.5)
Dividends Paid	0.0	(0.2)	(0.8)
Net Cash (Used in) Provided by Financing Activities	(4.8)	17.8	358.2
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(0.2)	(4.2)	2.3
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(14.1)	19.6	20.2
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	59.7	40.1	19.9
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR	45.6	59.7	40.1
Eliminations
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities	0.0	(0.2)	(0.8)
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment	0.0	0.0	0.0
Proceeds from Disposals of Property, Plant and Equipment	0.0	0.0	0.0
Proceeds from Principal Payments Received on Long-Term Note Receivable	0.0	0.0	0.0
Proceeds from Sale of Business		0.0
Acquisitions of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired	0.0		0.0
Payments to Acquire Notes Receivable			0.0
Purchases of Intangible Asset	0.0	0.0	0.0
Change in Investments in Subsidiaries		15.6	199.0
Loan Proceeds Received by the Parent from Subsidiaries		(1.2)
Loan Payments from Parent to Subsidiaries	(1.1)	(1.8)
Net Cash Used in Investing Activities	(1.1)	12.6	363.8
FINANCING ACTIVITIES
Proceeds from Debt	0.0	0.0	0.0
Loan Payments to Subsidiaries from the Parent	1.1	1.8	(164.8)
Loan Payments to Parents from Subsidiaries		1.2	164.8
Change in Subsidiary Equity		(15.6)	(199.0)
Repayments of Debt	0.0	0.0	0.0
Change in Finance Lease Obligation	0.0		0.0
Payments of Debt Issuance Costs			0.0
Proceeds from Issuance of Common Stock	0.0	0.0	0.0
Purchase of Noncontrolling Owner Interest	0.0
Dividends Paid	0.0	0.2	0.8
Net Cash (Used in) Provided by Financing Activities	1.1	(12.4)	(363.0)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0.0	0.0	0.0
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	0.0	0.0	0.0
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	0.0	0.0	0.0
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR	$ 0.0	$ 0.0	$ 0.0