Condensed Consolidating Financial Statements (Statements of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities:	$ 495.5	$ 325.1	$ 373.9
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.1	0.2	0.2
Purchases of property, plant and equipment	(95.2)	(98.3)	(84.3)
Net proceeds from sale of businesses and related property	114.7	0.0	0.0
Gain from insurance recoveries, net of losses incurred	(10.9)	0.0	0.0
Net cash used in investing activities	30.5	(98.1)	(84.1)
Cash flows from financing activities:
Short-term borrowings, net	0.0	(1.5)	(2.4)
Asset securitization borrowings	155.0	315.0	145.0
Asset securitization payments	(163.0)	(89.0)	(295.0)
Long-term debt borrowings	0.0	0.0	350.0
Borrowings from credit facility	2,435.9	2,376.5	2,336.5
Long-term debt payments	(33.0)	(200.9)	(58.8)
Payments on credit facility	(2,365.0)	(2,265.5)	(2,346.0)
Payments of deferred financing costs	0.0	(0.2)	(4.2)
Proceeds from employee stock purchases	3.3	3.1	2.6
Repurchases of common stock to satisfy employee withholding tax obligations	(26.9)	(26.1)	(33.3)
Repurchases of common stock	(450.2)	(250.0)	(300.0)
Intercompany debt	0.0	0.0	0.0
Intercompany financing activity	0.0	0.0	0.0
Cash dividends paid	(93.9)	(79.7)	(69.0)
Net cash used in financing activities	(537.8)	(218.3)	(274.6)
Increase (decrease) in cash and cash equivalents	(11.8)	8.7	15.2
Effect of exchange rates on cash and cash equivalents	(10.1)	9.3	(3.9)
Cash and cash equivalents, beginning of year	68.2	50.2	38.9
Cash and cash equivalents, end of year	46.3	68.2	50.2
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities:	53.7	467.4	17.8
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.0	0.0	0.0
Purchases of property, plant and equipment	0.0	0.0	0.0
Net proceeds from sale of businesses and related property	0.0
Gain from insurance recoveries, net of losses incurred	0.0
Net cash used in investing activities	0.0	0.0	0.0
Cash flows from financing activities:
Short-term borrowings, net	0.0	0.0	0.0
Asset securitization borrowings	0.0	0.0	0.0
Asset securitization payments	0.0	0.0	0.0
Long-term debt borrowings			350.0
Borrowings from credit facility	2,435.9	2,376.5	2,336.5
Long-term debt payments	(30.0)	(200.0)	(57.5)
Payments on credit facility	(2,365.0)	(2,265.5)	(2,346.0)
Payments of deferred financing costs		0.0	(4.2)
Proceeds from employee stock purchases	3.3	3.1	2.6
Repurchases of common stock to satisfy employee withholding tax obligations	(26.9)	(26.1)	(33.3)
Repurchases of common stock	(450.2)	(250.0)	(300.0)
Intercompany debt	(14.5)	56.4	30.0
Intercompany financing activity	487.8	(81.7)	73.8
Cash dividends paid	(93.9)	(79.7)	(69.0)
Net cash used in financing activities	(53.5)	(467.0)	(17.1)
Increase (decrease) in cash and cash equivalents	0.2	0.4	0.7
Effect of exchange rates on cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents, beginning of year	1.6	1.2	0.5
Cash and cash equivalents, end of year	1.8	1.6	1.2
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities:	477.9	31.1	218.5
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.0	0.1	0.0
Purchases of property, plant and equipment	(76.0)	(70.7)	(71.5)
Net proceeds from sale of businesses and related property	2.7
Gain from insurance recoveries, net of losses incurred	(10.9)
Net cash used in investing activities	(62.4)	(70.6)	(71.5)
Cash flows from financing activities:
Short-term borrowings, net	0.0	0.0	0.0
Asset securitization borrowings	0.0	0.0	0.0
Asset securitization payments	0.0	0.0	0.0
Long-term debt borrowings			0.0
Borrowings from credit facility	0.0	0.0	0.0
Long-term debt payments	(2.9)	(0.3)	(0.9)
Payments on credit facility	0.0	0.0	0.0
Payments of deferred financing costs		0.0	0.0
Proceeds from employee stock purchases	0.0	0.0	0.0
Repurchases of common stock to satisfy employee withholding tax obligations	0.0	0.0	0.0
Repurchases of common stock	0.0	0.0	0.0
Intercompany debt	83.3	(34.9)	(65.8)
Intercompany financing activity	(508.5)	85.6	(71.0)
Cash dividends paid	0.0	0.0	0.0
Net cash used in financing activities	(428.1)	50.4	(137.7)
Increase (decrease) in cash and cash equivalents	(12.6)	10.9	9.3
Effect of exchange rates on cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents, beginning of year	28.0	17.1	7.8
Cash and cash equivalents, end of year	15.4	28.0	17.1
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities:	(36.1)	(173.4)	137.6
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.1	0.1	0.2
Purchases of property, plant and equipment	(19.2)	(27.6)	(12.8)
Net proceeds from sale of businesses and related property	112.0
Gain from insurance recoveries, net of losses incurred	0.0
Net cash used in investing activities	92.9	(27.5)	(12.6)
Cash flows from financing activities:
Short-term borrowings, net	0.0	(1.5)	(2.4)
Asset securitization borrowings	155.0	315.0	145.0
Asset securitization payments	(163.0)	(89.0)	(295.0)
Long-term debt borrowings			0.0
Borrowings from credit facility	0.0	0.0	0.0
Long-term debt payments	(0.1)	(0.6)	(0.4)
Payments on credit facility	0.0	0.0	0.0
Payments of deferred financing costs		(0.2)	0.0
Proceeds from employee stock purchases	0.0	0.0	0.0
Repurchases of common stock to satisfy employee withholding tax obligations	0.0	0.0	0.0
Repurchases of common stock	0.0	0.0	0.0
Intercompany debt	(68.8)	(21.5)	35.8
Intercompany financing activity	20.7	(3.9)	(2.8)
Cash dividends paid	0.0	0.0	0.0
Net cash used in financing activities	(56.2)	198.3	(119.8)
Increase (decrease) in cash and cash equivalents	0.6	(2.6)	5.2
Effect of exchange rates on cash and cash equivalents	(10.1)	9.3	(3.9)
Cash and cash equivalents, beginning of year	38.6	31.9	30.6
Cash and cash equivalents, end of year	29.1	38.6	31.9
Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities:	0.0	0.0	0.0
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.0	0.0	0.0
Purchases of property, plant and equipment	0.0	0.0	0.0
Net proceeds from sale of businesses and related property	0.0
Gain from insurance recoveries, net of losses incurred	0.0
Net cash used in investing activities	0.0	0.0	0.0
Cash flows from financing activities:
Short-term borrowings, net	0.0	0.0	0.0
Asset securitization borrowings	0.0	0.0	0.0
Asset securitization payments	0.0	0.0	0.0
Long-term debt borrowings			0.0
Borrowings from credit facility	0.0	0.0	0.0
Long-term debt payments	0.0	0.0	0.0
Payments on credit facility	0.0	0.0	0.0
Payments of deferred financing costs		0.0	0.0
Proceeds from employee stock purchases	0.0	0.0	0.0
Repurchases of common stock to satisfy employee withholding tax obligations	0.0	0.0	0.0
Repurchases of common stock	0.0	0.0	0.0
Intercompany debt	0.0	0.0	0.0
Intercompany financing activity	0.0	0.0	0.0
Cash dividends paid	0.0	0.0	0.0
Net cash used in financing activities	0.0	0.0	0.0
Increase (decrease) in cash and cash equivalents	0.0	0.0	0.0
Effect of exchange rates on cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents, beginning of year	0.0	0.0	0.0
Cash and cash equivalents, end of year	$ 0.0	$ 0.0	$ 0.0