Condensed Consolidating Financial Statements (Statements of Cash Flows) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	$ (48.3)	$ (25.3)
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.2	0.0
Purchases of property, plant and equipment	(43.4)	(41.7)
Net cash used in investing activities	(43.2)	(41.7)
Cash flows from financing activities:
Short-term borrowings, net	(1.1)	0.5
Asset securitization borrowings	200.0	40.0
Asset securitization payments	0.0	(20.0)
Long-term debt payments	(200.5)	(8.2)
Borrowings from credit facility	1,352.5	1,184.5
Payments on credit facility	(1,031.0)	(864.0)
Proceeds from employee stock purchases	1.5	1.3
Repurchases of common stock	(175.0)	(200.0)
Repurchases of common stock to satisfy employee withholding tax obligations	(14.1)	(21.4)
Intercompany debt	0.0	0.0
Intercompany financing activity	0.0	0.0
Intercompany investments		0.0
Cash dividends paid	(36.9)	(31.8)
Net cash provided by financing activities	95.4	80.9
Increase in cash and cash equivalents	3.9	13.9
Effect of exchange rates on cash and cash equivalents	7.2	1.9
Cash and cash equivalents, beginning of period	50.2	38.9
Cash and cash equivalents, end of period	61.3	54.7
Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	0.0	0.0
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.0
Purchases of property, plant and equipment	0.0	0.0
Net cash used in investing activities	0.0	0.0
Cash flows from financing activities:
Short-term borrowings, net	0.0	0.0
Asset securitization borrowings	0.0	0.0
Asset securitization payments	0.0	0.0
Long-term debt payments	0.0	0.0
Borrowings from credit facility	0.0	0.0
Payments on credit facility	0.0	0.0
Proceeds from employee stock purchases	0.0	0.0
Repurchases of common stock	0.0	0.0
Repurchases of common stock to satisfy employee withholding tax obligations	0.0	0.0
Intercompany debt	0.0	0.0
Intercompany financing activity	0.0	0.0
Intercompany investments		0.0
Cash dividends paid	0.0	0.0
Net cash provided by financing activities	0.0	0.0
Increase in cash and cash equivalents	0.0	0.0
Effect of exchange rates on cash and cash equivalents	0.0	0.0
Cash and cash equivalents, beginning of period	0.0	0.0
Cash and cash equivalents, end of period	0.0	0.0
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	326.1	62.1
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.0
Purchases of property, plant and equipment	0.0	0.0
Net cash used in investing activities	0.0	0.0
Cash flows from financing activities:
Short-term borrowings, net	0.0	0.0
Asset securitization borrowings	0.0	0.0
Asset securitization payments	0.0	0.0
Long-term debt payments	(200.0)	(7.5)
Borrowings from credit facility	1,352.5	1,184.5
Payments on credit facility	(1,031.0)	(864.0)
Proceeds from employee stock purchases	1.5	1.3
Repurchases of common stock	(175.0)	(200.0)
Repurchases of common stock to satisfy employee withholding tax obligations	(14.1)	(21.4)
Intercompany debt	(25.5)	(11.9)
Intercompany financing activity	(195.4)	(110.2)
Intercompany investments		0.0
Cash dividends paid	(36.9)	(31.8)
Net cash provided by financing activities	(323.9)	(61.0)
Increase in cash and cash equivalents	2.2	1.1
Effect of exchange rates on cash and cash equivalents	0.0	0.0
Cash and cash equivalents, beginning of period	1.2	0.5
Cash and cash equivalents, end of period	3.4	1.6
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	(191.4)	(51.3)
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.1
Purchases of property, plant and equipment	(37.2)	(36.8)
Net cash used in investing activities	(37.1)	(36.8)
Cash flows from financing activities:
Short-term borrowings, net	0.0	0.0
Asset securitization borrowings	0.0	0.0
Asset securitization payments	0.0	0.0
Long-term debt payments	(0.2)	(0.5)
Borrowings from credit facility	0.0	0.0
Payments on credit facility	0.0	0.0
Proceeds from employee stock purchases	0.0	0.0
Repurchases of common stock	0.0	0.0
Repurchases of common stock to satisfy employee withholding tax obligations	0.0	0.0
Intercompany debt	6.4	(4.3)
Intercompany financing activity	230.1	109.1
Intercompany investments		0.0
Cash dividends paid	0.0	0.0
Net cash provided by financing activities	236.3	104.3
Increase in cash and cash equivalents	7.8	16.2
Effect of exchange rates on cash and cash equivalents	0.0	0.0
Cash and cash equivalents, beginning of period	17.1	7.8
Cash and cash equivalents, end of period	24.9	24.0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	(183.0)	(36.1)
Cash flows from investing activities:
Proceeds from the disposal of property, plant and equipment	0.1
Purchases of property, plant and equipment	(6.2)	(4.9)
Net cash used in investing activities	(6.1)	(4.9)
Cash flows from financing activities:
Short-term borrowings, net	(1.1)	0.5
Asset securitization borrowings	200.0	40.0
Asset securitization payments	0.0	(20.0)
Long-term debt payments	(0.3)	(0.2)
Borrowings from credit facility	0.0	0.0
Payments on credit facility	0.0	0.0
Proceeds from employee stock purchases	0.0	0.0
Repurchases of common stock	0.0	0.0
Repurchases of common stock to satisfy employee withholding tax obligations	0.0	0.0
Intercompany debt	19.1	16.2
Intercompany financing activity	(34.7)	1.1
Intercompany investments		0.0
Cash dividends paid	0.0	0.0
Net cash provided by financing activities	183.0	37.6
Increase in cash and cash equivalents	(6.1)	(3.4)
Effect of exchange rates on cash and cash equivalents	7.2	1.9
Cash and cash equivalents, beginning of period	31.9	30.6
Cash and cash equivalents, end of period	$ 33.0	$ 29.1