Separate Financial Information of Guarantor Subsidiaries Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities		$ 46.2	$ 43.6
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		(28.3)	(12.7)
Proceeds from Sale of Property, Plant, and Equipment		0.1	0.1
Proceeds from Principal Payments Received on Long-Term Note Receivable		0.1	0.8
Proceeds from Sale of Business		0.0	4.0
Acquisition of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired		(8.9)	0.0
Purchase of Intangible Assets		(0.5)	(2.6)
Change in Investments in Subsidiaries			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		(37.5)	(10.4)
FINANCING ACTIVITIES
Proceeds from Credit Facility Borrowings		25.0	0.0
Loan Payments to Subsidiaries from the Parent		0.0	0.0
Loan Payments to Parents from Subsidiaries			0.0
Change in Subsidiary Equity			0.0
Repayments of Debt		(37.9)	(30.2)
Change in Finance Lease Obligations		(0.2)	0.0
Proceeds from Issuance of Common Stock		2.8	5.7
Purchase of Noncontrolling Owner Interests	$ 0.0	(0.5)	0.0
Dividends Paid		(12.0)	(11.3)
Net Cash (Used in) Provided by Financing Activities		(22.8)	(35.8)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash		(0.3)	(2.3)
Net Decrease in Cash, Cash Equivalents and Restricted Cash		(14.4)	(4.9)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		86.1	59.0
Cash, Cash Equivalents and Restricted Cash at End of Period		71.7	54.1
Eliminations
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities		0.0	0.0
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		0.0	0.0
Proceeds from Sale of Property, Plant, and Equipment		0.0	0.0
Proceeds from Principal Payments Received on Long-Term Note Receivable		0.0	0.0
Proceeds from Sale of Business			0.0
Acquisition of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired		0.0
Purchase of Intangible Assets		0.0	0.0
Change in Investments in Subsidiaries			1.8
Loan Proceeds Received by the Parent from Subsidiaries			(1.2)
Loan Payments from Parent to Subsidiaries		0.6	(1.0)
Net Cash Used in Investing Activities		0.6	(0.4)
FINANCING ACTIVITIES
Proceeds from Credit Facility Borrowings		0.0
Loan Payments to Subsidiaries from the Parent		(0.6)	1.0
Loan Payments to Parents from Subsidiaries			1.2
Change in Subsidiary Equity			(1.8)
Repayments of Debt		0.0	0.0
Change in Finance Lease Obligations		0.0
Proceeds from Issuance of Common Stock		0.0	0.0
Purchase of Noncontrolling Owner Interests		0.0
Dividends Paid		0.0	0.0
Net Cash (Used in) Provided by Financing Activities		(0.6)	0.4
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash		0.0	0.0
Net Decrease in Cash, Cash Equivalents and Restricted Cash		0.0	0.0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		0.0	0.0
Cash, Cash Equivalents and Restricted Cash at End of Period		0.0	0.0
Parent
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities		43.2	43.7
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		(20.5)	(4.5)
Proceeds from Sale of Property, Plant, and Equipment		0.1	0.0
Proceeds from Principal Payments Received on Long-Term Note Receivable		0.0	0.0
Proceeds from Sale of Business			0.0
Acquisition of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired		0.0
Purchase of Intangible Assets		0.0	(2.5)
Change in Investments in Subsidiaries			(1.8)
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		(20.4)	(7.6)
FINANCING ACTIVITIES
Proceeds from Credit Facility Borrowings		25.0
Loan Payments to Subsidiaries from the Parent		0.6	(1.0)
Loan Payments to Parents from Subsidiaries			0.0
Change in Subsidiary Equity			0.0
Repayments of Debt		(33.8)	(30.0)
Change in Finance Lease Obligations		0.0
Proceeds from Issuance of Common Stock		2.8	5.7
Purchase of Noncontrolling Owner Interests		0.0
Dividends Paid		(12.0)	(11.3)
Net Cash (Used in) Provided by Financing Activities		(17.4)	(36.6)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash		0.0	0.1
Net Decrease in Cash, Cash Equivalents and Restricted Cash		5.4	(0.4)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		24.8	18.5
Cash, Cash Equivalents and Restricted Cash at End of Period		30.2	18.1
Guarantor Subsidiaries
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities		(0.1)	0.2
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		(0.2)	0.0
Proceeds from Sale of Property, Plant, and Equipment		0.0	0.0
Proceeds from Principal Payments Received on Long-Term Note Receivable		0.0	0.0
Proceeds from Sale of Business			0.0
Acquisition of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired		0.0
Purchase of Intangible Assets		0.0	0.0
Change in Investments in Subsidiaries			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		(0.2)	0.0
FINANCING ACTIVITIES
Proceeds from Credit Facility Borrowings		0.0
Loan Payments to Subsidiaries from the Parent		0.0	0.0
Loan Payments to Parents from Subsidiaries			0.0
Change in Subsidiary Equity			0.0
Repayments of Debt		0.0	0.0
Change in Finance Lease Obligations		0.0
Proceeds from Issuance of Common Stock		0.0	0.0
Purchase of Noncontrolling Owner Interests		0.0
Dividends Paid		0.0	0.0
Net Cash (Used in) Provided by Financing Activities		0.0	0.0
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash		0.0	0.0
Net Decrease in Cash, Cash Equivalents and Restricted Cash		(0.3)	0.2
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		1.6	0.5
Cash, Cash Equivalents and Restricted Cash at End of Period		1.3	0.7
Non-Guarantor Subsidiaries
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities		3.1	(0.3)
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		(7.6)	(8.2)
Proceeds from Sale of Property, Plant, and Equipment		0.0	0.1
Proceeds from Principal Payments Received on Long-Term Note Receivable		0.1	0.8
Proceeds from Sale of Business			4.0
Acquisition of Businesses, Net of Cash, Cash Equivalents and Restricted Cash Acquired		(8.9)
Purchase of Intangible Assets		(0.5)	(0.1)
Change in Investments in Subsidiaries			0.0
Loan Proceeds Received by the Parent from Subsidiaries			0.0
Loan Payments from Parent to Subsidiaries		(0.6)	1.0
Net Cash Used in Investing Activities		(17.5)	(2.4)
FINANCING ACTIVITIES
Proceeds from Credit Facility Borrowings		0.0
Loan Payments to Subsidiaries from the Parent		0.0	0.0
Loan Payments to Parents from Subsidiaries			(1.2)
Change in Subsidiary Equity			1.8
Repayments of Debt		(4.1)	(0.2)
Change in Finance Lease Obligations		(0.2)
Proceeds from Issuance of Common Stock		0.0	0.0
Purchase of Noncontrolling Owner Interests		0.5
Dividends Paid		0.0	0.0
Net Cash (Used in) Provided by Financing Activities		(4.8)	0.4
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash		(0.3)	(2.4)
Net Decrease in Cash, Cash Equivalents and Restricted Cash		(19.5)	(4.7)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		59.7	40.0
Cash, Cash Equivalents and Restricted Cash at End of Period		$ 40.2	$ 35.3