Supplemental Guarantor Information -Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	$ 350.5	$ 370.8
Capital expenditures	(34.4)	(30.5)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	(20.9)	0
Net cash used in investing activities	(56.0)	(30.5)
Proceeds from Lines of Credit	0	63.0
Repayments of Lines of Credit	0	(63.0)
Repayments of long-term debt	(11.6)	(47.2)
Proceeds from Issuance of Long-term Debt	600.0	1,535.2
Repayments of Long-term Debt	(723.9)	(1,885.9)
Payments of Financing Costs	(14.4)	(6.0)
Net change in accounts payable-inventory financing	43.1	(24.0)
Proceeds from Issuance of Common Stock	0	424.7
Proceeds from stock option exercises	1.1	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	3.7	0
Payments of Ordinary Dividends, Common Stock	(21.9)	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	0.2	0
Net cash used in financing activities	(123.7)	(27.4)
Effect of exchange rate changes on cash and cash equivalents	(1.1)	(0.6)
Net increase (decrease) in cash and cash equivalents	169.7	312.3
Cash and cash equivalents - beginning of period	188.1	37.9
Cash and cash equivalents - end of period	357.8	350.2
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	0	(15.2)
Capital expenditures	0	0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Payments for Derivative Instrument, Financing Activities	0
Net cash used in investing activities	0	0
Proceeds from Lines of Credit		0
Repayments of Lines of Credit		0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Payments of Financing Costs	0
Net change in accounts payable-inventory financing	0	0
Payment of incentive compensation plan withholding taxes, employer portion		0
Proceeds from Issuance of Common Stock		424.7
Proceeds from stock option exercises	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	0
Payments of Ordinary Dividends, Common Stock	(21.9)
Excess Tax Benefit from Share-based Compensation, Financing Activities	0
Advances from (to) affiliates	21.9	(409.5)
Other financing activities		0
Net cash used in financing activities	0	15.2
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	(127.2)	(71.5)
Capital expenditures	(29.9)	(27.2)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	(20.9)
Payments for Derivative Instrument, Financing Activities	(0.7)
Net cash used in investing activities	(51.5)	(27.2)
Proceeds from Lines of Credit		63.0
Repayments of Lines of Credit		(63.0)
Repayments of long-term debt	(11.6)	(47.2)
Proceeds from Issuance of Long-term Debt	600.0	1,535.2
Repayments of Long-term Debt	(723.9)	(1,885.9)
Payments of Financing Costs	(14.4)
Net change in accounts payable-inventory financing	0	0
Payment of incentive compensation plan withholding taxes, employer portion		(4.0)
Proceeds from Issuance of Common Stock		0
Proceeds from stock option exercises	1.1
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	3.7
Payments of Ordinary Dividends, Common Stock	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	0.2
Advances from (to) affiliates	467.1	788.1
Other financing activities		(6.1)
Net cash used in financing activities	322.2	380.1
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	143.5	281.4
Cash and cash equivalents - beginning of period	196.5	48.0
Cash and cash equivalents - end of period	340.0	329.4
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	450.9	425.5
Capital expenditures	(4.5)	(3.2)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Payments for Derivative Instrument, Financing Activities	0
Net cash used in investing activities	(4.5)	(3.2)
Proceeds from Lines of Credit		0
Repayments of Lines of Credit		0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Payments of Financing Costs	0
Net change in accounts payable-inventory financing	43.1	(24.0)
Payment of incentive compensation plan withholding taxes, employer portion		(19.6)
Proceeds from Issuance of Common Stock		0
Proceeds from stock option exercises	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	0
Payments of Ordinary Dividends, Common Stock	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	0
Advances from (to) affiliates	(489.5)	(378.7)
Other financing activities		0
Net cash used in financing activities	(446.4)	(422.3)
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
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	17.1	19.0
Capital expenditures	0	(0.1)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Payments for Derivative Instrument, Financing Activities	0
Net cash used in investing activities	0	(0.1)
Proceeds from Lines of Credit		0
Repayments of Lines of Credit		0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Payments of Financing Costs	0
Net change in accounts payable-inventory financing	0	0
Payment of incentive compensation plan withholding taxes, employer portion		(0.5)
Proceeds from Issuance of Common Stock		0
Proceeds from stock option exercises	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	0
Payments of Ordinary Dividends, Common Stock	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	0
Advances from (to) affiliates	0.5	0.1
Other financing activities		0
Net cash used in financing activities	0.5	(0.4)
Effect of exchange rate changes on cash and cash equivalents	(1.1)	(0.6)
Net increase (decrease) in cash and cash equivalents	16.5	17.9
Cash and cash equivalents - beginning of period	14.0	9.8
Cash and cash equivalents - end of period	30.5	27.7
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
Payments for Derivative Instrument, Financing Activities	0
Net cash used in investing activities	0	0
Proceeds from Lines of Credit		0
Repayments of Lines of Credit		0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Payments of Financing Costs	0
Net change in accounts payable-inventory financing	0	0
Payment of incentive compensation plan withholding taxes, employer portion		0
Proceeds from Issuance of Common Stock		0
Proceeds from stock option exercises	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	0
Payments of Ordinary Dividends, Common Stock	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	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	9.7	13.0
Capital expenditures	0	0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	0
Payments for Derivative Instrument, Financing Activities	0
Net cash used in investing activities	0	0
Proceeds from Lines of Credit		0
Repayments of Lines of Credit		0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Payments of Financing Costs	0
Net change in accounts payable-inventory financing	0	0
Payment of incentive compensation plan withholding taxes, employer portion		0
Proceeds from Issuance of Common Stock		0
Proceeds from stock option exercises	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	0
Payments of Ordinary Dividends, Common Stock	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	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	9.7	13.0
Cash and cash equivalents - beginning of period	(22.4)	(19.9)
Cash and cash equivalents - end of period	(12.7)	(6.9)
Consolidated [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	350.5	370.8
Capital expenditures	(34.4)	(30.5)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II	(20.9)
Payments for Derivative Instrument, Financing Activities	(0.7)
Net cash used in investing activities	(56.0)	(30.5)
Proceeds from Lines of Credit		63.0
Repayments of Lines of Credit		(63.0)
Repayments of long-term debt	(11.6)	(47.2)
Proceeds from Issuance of Long-term Debt	600.0	1,535.2
Repayments of Long-term Debt	(723.9)	(1,885.9)
Payments of Financing Costs	(14.4)
Net change in accounts payable-inventory financing	43.1	(24.0)
Payment of incentive compensation plan withholding taxes, employer portion		(24.1)
Proceeds from Issuance of Common Stock		424.7
Proceeds from stock option exercises	1.1
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	3.7
Payments of Ordinary Dividends, Common Stock	(21.9)
Excess Tax Benefit from Share-based Compensation, Financing Activities	0.2
Advances from (to) affiliates	0	0
Other financing activities		(6.1)
Net cash used in financing activities	(123.7)	(27.4)
Effect of exchange rate changes on cash and cash equivalents	(1.1)	(0.6)
Net increase (decrease) in cash and cash equivalents	169.7	312.3
Cash and cash equivalents - beginning of period	188.1	37.9
Cash and cash equivalents - end of period	$ 357.8	$ 350.2