Guarantor Financial Information - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			$ (4.2)	$ 10.4
INVESTING ACTIVITIES
Capital expenditures	$ (8.9)	$ (7.2)	(35.1)	(22.8)
Proceeds from sale of building			30.6	0.0
Proceeds from disposition			0.0	77.1
Acquisition of business, net of cash acquired			(2.6)	0.0
(Purchase) sale of investment			(2.3)	3.1
Intercompany note receivable, net			0.0	0.0
Net cash (used in) provided by investing activities			(9.4)	57.4
FINANCING ACTIVITIES
Revolving facility borrowings			413.0	255.0
Payments on revolving facility borrowings			(413.0)	(255.0)
Payments on long-term debt			0.0	(62.5)
Intercompany note payable, net			0.0	0.0
Dividends paid to Parent			0.0
Proceeds from the issuance of common stock			0.0	1.2
Treasury share repurchases			(1.3)	(0.8)
Debt issuance costs			(0.2)	0.0
Net cash used in financing activities			(1.5)	(62.1)
Effect of exchange rate on cash, cash equivalents and restricted cash			2.2	(1.5)
Net (decrease) increase in cash, cash equivalents and restricted cash			(12.9)	4.2
Cash, cash equivalents and restricted cash at beginning of year			47.4	52.0
Cash, cash equivalents and restricted cash at end of period	34.5	56.2	34.5	56.2
Supplemental non-cash disclosure:
Intercompany debt allocation				0.0
Eliminations
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			(53.1)	0.0
INVESTING ACTIVITIES
Capital expenditures			0.0	0.0
Proceeds from sale of building			0.0
Proceeds from disposition				0.0
Acquisition of business, net of cash acquired			0.0
(Purchase) sale of investment			0.0	0.0
Intercompany note receivable, net			(60.5)	15.0
Net cash (used in) provided by investing activities			(60.5)	15.0
FINANCING ACTIVITIES
Revolving facility borrowings			0.0	0.0
Payments on revolving facility borrowings			0.0	0.0
Payments on long-term debt				0.0
Intercompany note payable, net			60.5	(15.0)
Dividends paid to Parent			53.1
Proceeds from the issuance of common stock				0.0
Treasury share repurchases			0.0	0.0
Net cash used in financing activities			113.6	(15.0)
Effect of exchange rate on cash, cash equivalents and restricted cash			0.0	0.0
Net (decrease) increase in cash, cash equivalents and restricted cash			0.0	0.0
Cash, cash equivalents and restricted cash at beginning of year			0.0	0.0
Cash, cash equivalents and restricted cash at end of period	0.0	0.0	0.0	0.0
Supplemental non-cash disclosure:
Intercompany debt allocation				0.0
Parent
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			54.5	59.3
INVESTING ACTIVITIES
Capital expenditures			0.0	0.0
Proceeds from sale of building			0.0
Proceeds from disposition				0.0
Acquisition of business, net of cash acquired			0.0
(Purchase) sale of investment			0.0	0.0
Intercompany note receivable, net			0.0	0.0
Net cash (used in) provided by investing activities			0.0	0.0
FINANCING ACTIVITIES
Revolving facility borrowings			413.0	255.0
Payments on revolving facility borrowings			(413.0)	(255.0)
Payments on long-term debt				(62.5)
Intercompany note payable, net			(60.5)	15.0
Dividends paid to Parent			0.0
Proceeds from the issuance of common stock				1.2
Treasury share repurchases			(1.3)	(0.8)
Debt issuance costs			(0.2)
Net cash used in financing activities			(62.0)	(47.1)
Effect of exchange rate on cash, cash equivalents and restricted cash			0.0	0.0
Net (decrease) increase in cash, cash equivalents and restricted cash			(7.5)	12.2
Cash, cash equivalents and restricted cash at beginning of year			24.9	8.3
Cash, cash equivalents and restricted cash at end of period	17.4	20.5	17.4	20.5
Supplemental non-cash disclosure:
Intercompany debt allocation				(326.0)
Guarantor Subsidiaries
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			9.2	(38.0)
INVESTING ACTIVITIES
Capital expenditures			(35.0)	(21.9)
Proceeds from sale of building			30.6
Proceeds from disposition				34.5
Acquisition of business, net of cash acquired			(2.6)
(Purchase) sale of investment			(2.3)	3.1
Intercompany note receivable, net			0.0	0.0
Net cash (used in) provided by investing activities			(9.3)	15.7
FINANCING ACTIVITIES
Revolving facility borrowings			0.0	0.0
Payments on revolving facility borrowings			0.0	0.0
Payments on long-term debt				0.0
Intercompany note payable, net			0.0	0.0
Dividends paid to Parent			0.0
Proceeds from the issuance of common stock				0.0
Treasury share repurchases			0.0	0.0
Debt issuance costs			0.0
Net cash used in financing activities			0.0	0.0
Effect of exchange rate on cash, cash equivalents and restricted cash			0.0	0.0
Net (decrease) increase in cash, cash equivalents and restricted cash			(0.1)	(22.3)
Cash, cash equivalents and restricted cash at beginning of year			5.1	27.9
Cash, cash equivalents and restricted cash at end of period	5.0	5.6	5.0	5.6
Supplemental non-cash disclosure:
Intercompany debt allocation				326.0
Non-guarantor Subsidiaries
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			(14.8)	(10.9)
INVESTING ACTIVITIES
Capital expenditures			(0.1)	(0.9)
Proceeds from sale of building			0.0
Proceeds from disposition				42.6
Acquisition of business, net of cash acquired			0.0
(Purchase) sale of investment			0.0	0.0
Intercompany note receivable, net			60.5	(15.0)
Net cash (used in) provided by investing activities			60.4	26.7
FINANCING ACTIVITIES
Revolving facility borrowings			0.0	0.0
Payments on revolving facility borrowings			0.0	0.0
Payments on long-term debt				0.0
Intercompany note payable, net			0.0	0.0
Dividends paid to Parent			(53.1)
Proceeds from the issuance of common stock				0.0
Treasury share repurchases			0.0	0.0
Net cash used in financing activities			(53.1)	0.0
Effect of exchange rate on cash, cash equivalents and restricted cash			2.2	(1.5)
Net (decrease) increase in cash, cash equivalents and restricted cash			(5.3)	14.3
Cash, cash equivalents and restricted cash at beginning of year			17.4	15.8
Cash, cash equivalents and restricted cash at end of period	$ 12.1	$ 30.1	$ 12.1	30.1
Supplemental non-cash disclosure:
Intercompany debt allocation				$ 0.0

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