Condensed Consolidating Financial Statements (Statements of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	$ (107.6)	$ (101.6)
Proceeds from Sale of Property, Plant, and Equipment	(0.1)	0.0
Cash flows from investing activities:
Purchases of property, plant and equipment	(24.9)	(23.8)
Net cash used in investing activities	(24.8)	(23.8)
Cash flows from financing activities:
Short-term borrowings, net	(0.8)	(0.4)
Asset securitization borrowings	150.0	0.0
Asset securitization payments	0.0	(20.0)
Long-term debt payments	(0.2)	(0.3)
Borrowings from credit facility	583.0	770.5
Payments on credit facility	(497.5)	(392.0)
Proceeds from employee stock purchases	0.7	0.6
Repurchases of common stock	(75.0)	(200.0)
Payments Related to Tax Withholding for Share-based Compensation	13.3	16.8
Intercompany debt	0.0
Intercompany financing activity	0.0	0.0
Intercompany investments		0.0
Cash dividends paid	(18.5)	(16.1)
Net cash provided by financing activities	128.4	125.5
(Decrease) increase in cash and cash equivalents	(4.0)	0.1
Effect of exchange rates on cash and cash equivalents	2.6	1.6
Cash and cash equivalents, beginning of period	50.2	38.9
Cash and cash equivalents, end of period	48.8	40.6
Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	0.0	0.0
Proceeds from Sale of Property, Plant, and Equipment	0.0	0.0
Cash flows from investing activities:
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
Payments Related to Tax Withholding for Share-based Compensation	0.0	0.0
Intercompany debt	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
(Decrease) 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	341.2	59.0
Proceeds from Sale of Property, Plant, and Equipment	0.0	0.0
Cash flows from investing activities:
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	583.0	770.5
Payments on credit facility	(497.5)	(392.0)
Proceeds from employee stock purchases	0.7	0.6
Repurchases of common stock	(75.0)	(200.0)
Payments Related to Tax Withholding for Share-based Compensation	13.3	16.8
Intercompany debt	(29.3)
Intercompany financing activity	(291.0)	(8.6)
Intercompany investments		(196.1)
Cash dividends paid	(18.5)	(16.1)
Net cash provided by financing activities	(340.9)	(58.5)
(Decrease) increase in cash and cash equivalents	0.3	0.5
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	1.5	1.0
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	(308.6)	(163.1)
Proceeds from Sale of Property, Plant, and Equipment	0.0	0.0
Cash flows from investing activities:
Purchases of property, plant and equipment	(22.0)	(20.9)
Net cash used in investing activities	(22.0)	(20.9)
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	(0.1)	(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
Payments Related to Tax Withholding for Share-based Compensation	0.0	0.0
Intercompany debt	7.6
Intercompany financing activity	320.0	(2.9)
Intercompany investments		194.5
Cash dividends paid	0.0	0.0
Net cash provided by financing activities	327.5	191.4
(Decrease) increase in cash and cash equivalents	(3.1)	7.4
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	14.0	15.2
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	(140.2)	2.5
Proceeds from Sale of Property, Plant, and Equipment	(0.1)	0.0
Cash flows from investing activities:
Purchases of property, plant and equipment	(2.9)	(2.9)
Net cash used in investing activities	(2.8)	(2.9)
Cash flows from financing activities:
Short-term borrowings, net	(0.8)	(0.4)
Asset securitization borrowings	150.0	0.0
Asset securitization payments	0.0	(20.0)
Long-term debt payments	(0.1)	(0.1)
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
Payments Related to Tax Withholding for Share-based Compensation	0.0	0.0
Intercompany debt	21.7
Intercompany financing activity	(29.0)	11.5
Intercompany investments		1.6
Cash dividends paid	0.0	0.0
Net cash provided by financing activities	141.8	(7.4)
(Decrease) increase in cash and cash equivalents	(1.2)	(7.8)
Effect of exchange rates on cash and cash equivalents	2.6	1.6
Cash and cash equivalents, beginning of period	31.9	30.6
Cash and cash equivalents, end of period	$ 33.3	$ 24.4