Supplemental Guarantor Information -Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	$ 246.3	$ 208.0
Capital expenditures	(9.3)	(8.8)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	(20.9)	0
Net cash used in investing activities	(30.2)	(8.8)
Repayments of long-term debt	(3.9)	(40.0)
Payments to extinguish long-term debt	(79.5)	(53.1)
Net change in accounts payable-inventory financing	(6.4)	3.7
Proceeds from stock option exercises	0.1	0
Payments of Ordinary Dividends, Common Stock	(7.3)	0
Net cash used in financing activities	(97.0)	(89.5)
Effect of exchange rate changes on cash and cash equivalents	(0.5)	(0.5)
Net increase (decrease) in cash and cash equivalents	118.6	109.2
Cash and cash equivalents - beginning of period	188.1
Cash and cash equivalents - end of period	306.7	188.1
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	0	0
Capital expenditures	0	0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Net cash used in investing activities	0	0
Repayments of long-term debt	0	0
Payments to extinguish long-term debt	0	0
Net change in accounts payable-inventory financing	0	0
Proceeds from stock option exercises	0.1
Payments of Ordinary Dividends, Common Stock	(7.3)
Advances from (to) affiliates	7.2	0
Other financing activities		0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	14.3	9.7
Capital expenditures	(8.6)	(7.8)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	(20.9)
Net cash used in investing activities	(29.5)	(7.8)
Repayments of long-term debt	(3.9)	(40.0)
Payments to extinguish long-term debt	(79.5)	(53.1)
Net change in accounts payable-inventory financing	0	0
Proceeds from stock option exercises	0
Payments of Ordinary Dividends, Common Stock	0
Advances from (to) affiliates	192.6	166.7
Other financing activities		(0.1)
Net cash used in financing activities	109.2	73.5
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	94.0	75.4
Cash and cash equivalents - beginning of period	196.5	48.0
Cash and cash equivalents - end of period	290.5	123.4
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	207.0	171.7
Capital expenditures	(0.7)	(1.0)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Net cash used in investing activities	(0.7)	(1.0)
Repayments of long-term debt	0	0
Payments to extinguish long-term debt	0	0
Net change in accounts payable-inventory financing	(6.4)	3.7
Proceeds from stock option exercises	0
Payments of Ordinary Dividends, Common Stock	0
Advances from (to) affiliates	(199.9)	(166.5)
Other financing activities		0
Net cash used in financing activities	(206.3)	(162.8)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	7.9
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	7.9
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	8.6	7.1
Capital expenditures	0	0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Net cash used in investing activities	0	0
Repayments of long-term debt	0	0
Payments to extinguish long-term debt	0	0
Net change in accounts payable-inventory financing	0	0
Proceeds from stock option exercises	0
Payments of Ordinary Dividends, Common Stock	0
Advances from (to) affiliates	0.1	(0.2)
Other financing activities		0
Net cash used in financing activities	0.1	(0.2)
Effect of exchange rate changes on cash and cash equivalents	(0.5)	(0.5)
Net increase (decrease) in cash and cash equivalents	8.2	6.4
Cash and cash equivalents - beginning of period	14.0	9.8
Cash and cash equivalents - end of period	22.2	16.2
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	0	0
Capital expenditures	0	0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Net cash used in investing activities	0	0
Repayments of long-term debt	0	0
Payments to extinguish long-term debt	0	0
Net change in accounts payable-inventory financing	0	0
Proceeds from stock option exercises	0
Payments of Ordinary Dividends, Common Stock	0
Advances from (to) affiliates	0	0
Other financing activities		0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	16.4	19.5
Capital expenditures	0	0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Net cash used in investing activities	0	0
Repayments of long-term debt	0	0
Payments to extinguish long-term debt	0	0
Net change in accounts payable-inventory financing	0	0
Proceeds from stock option exercises	0
Payments of Ordinary Dividends, Common Stock	0
Advances from (to) affiliates	0	0
Other financing activities		0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	16.4	19.5
Cash and cash equivalents - beginning of period	(22.4)	(19.9)
Cash and cash equivalents - end of period	(6.0)	(0.4)
Consolidated [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	246.3	208.0
Capital expenditures	(9.3)	(8.8)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	(20.9)
Net cash used in investing activities	(30.2)	(8.8)
Repayments of long-term debt	(3.9)	(40.0)
Payments to extinguish long-term debt	(79.5)	(53.1)
Net change in accounts payable-inventory financing	(6.4)	3.7
Proceeds from stock option exercises	0.1
Payments of Ordinary Dividends, Common Stock	(7.3)
Advances from (to) affiliates	0	0
Other financing activities		(0.1)
Net cash used in financing activities	(97.0)	(89.5)
Effect of exchange rate changes on cash and cash equivalents	(0.5)	(0.5)
Net increase (decrease) in cash and cash equivalents	118.6	109.2
Cash and cash equivalents - beginning of period	188.1	37.9
Cash and cash equivalents - end of period	$ 306.7	$ 147.1