Supplemental Guarantor Information -Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities		$ 294.9	$ 350.5
Payments to Acquire Property, Plant, and Equipment		(43.9)	(34.4)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II		0.0	20.9
Payments to Acquire Businesses, Net of Cash Acquired		(263.8)	0.0
Net cash used in investing activities		(308.2)	(56.0)
Proceeds from Lines of Credit		105.0	0.0
Repayments of Lines of Credit		(105.0)	0.0
Repayments of long-term debt		(26.1)	(11.6)
Proceeds from Issuance of Long-term Debt		525.0	600.0
Repayments of Long-term Debt		(525.3)	(723.9)
Payments of Financing Costs		(6.8)	(14.4)
Net change in accounts payable-inventory financing		22.6	43.1
Proceeds from stock option exercises		1.7	1.1
Proceeds from Coworker Stock Purchase Plan		6.5	3.7
Stock Repurchased and Retired During Period, Value	$ 0.0	(193.3)
Payments of Ordinary Dividends, Common Stock		(34.6)	(21.9)
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.4	0.2
Net cash used in financing activities		(229.9)	(123.7)
Effect of exchange rate changes on cash and cash equivalents		(3.8)	(1.1)
Net increase (decrease) in cash and cash equivalents		(247.0)	169.7
Cash and cash equivalents - beginning of period		344.5	188.1
Cash and cash equivalents - end of period	357.8	97.5	357.8
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities		0.0	0.0
Payments to Acquire Property, Plant, and Equipment		0.0	0.0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II			0.0
Payments for Derivative Instrument, Financing Activities		0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Net cash used in investing activities		0.0	0.0
Proceeds from Lines of Credit		0.0
Repayments of Lines of Credit		0.0
Repayments of long-term debt		0.0	0.0
Proceeds from Issuance of Long-term Debt		0.0	0.0
Repayments of Long-term Debt		0.0	0.0
Payments of Financing Costs		0.0	0.0
Net change in accounts payable-inventory financing		0.0	0.0
Proceeds from stock option exercises		0.0	0.0
Proceeds from Coworker Stock Purchase Plan		0.0	0.0
Stock Repurchased and Retired During Period, Value		(193.3)
Payments of Ordinary Dividends, Common Stock		(34.6)	(21.9)
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.0	0.0
Advances from (to) affiliates		227.9	21.9
Net cash used in financing activities		0.0	0.0
Effect of exchange rate changes on cash and cash equivalents		0.0	0.0
Net increase (decrease) in 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	0.0
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities		(36.2)	(127.2)
Payments to Acquire Property, Plant, and Equipment		(35.2)	(29.9)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II			20.9
Payments for Derivative Instrument, Financing Activities		(0.5)	(0.7)
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Net cash used in investing activities		(35.7)	(51.5)
Proceeds from Lines of Credit		105.0
Repayments of Lines of Credit		(105.0)
Repayments of long-term debt		(11.6)	(11.6)
Proceeds from Issuance of Long-term Debt		525.0	600.0
Repayments of Long-term Debt		(525.3)	(723.9)
Payments of Financing Costs		(6.8)	(14.4)
Net change in accounts payable-inventory financing		0.0	0.0
Proceeds from stock option exercises		1.7	1.1
Proceeds from Coworker Stock Purchase Plan		6.5	3.7
Stock Repurchased and Retired During Period, Value		0.0
Payments of Ordinary Dividends, Common Stock		0.0	0.0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.4	0.2
Advances from (to) affiliates		(218.3)	467.1
Net cash used in financing activities		(228.4)	322.2
Effect of exchange rate changes on cash and cash equivalents		0.0	0.0
Net increase (decrease) in cash and cash equivalents		(300.3)	143.5
Cash and cash equivalents - beginning of period		346.4	196.5
Cash and cash equivalents - end of period	340.0	46.1	340.0
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities		331.7	450.9
Payments to Acquire Property, Plant, and Equipment		(7.4)	(4.5)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II			0.0
Payments for Derivative Instrument, Financing Activities		0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Net cash used in investing activities		(7.4)	(4.5)
Proceeds from Lines of Credit		0.0
Repayments of Lines of Credit		0.0
Repayments of long-term debt		0.0	0.0
Proceeds from Issuance of Long-term Debt		0.0	0.0
Repayments of Long-term Debt		0.0	0.0
Payments of Financing Costs		0.0	0.0
Net change in accounts payable-inventory financing		22.6	43.1
Proceeds from stock option exercises		0.0	0.0
Proceeds from Coworker Stock Purchase Plan		0.0	0.0
Stock Repurchased and Retired During Period, Value		0.0
Payments of Ordinary Dividends, Common Stock		0.0	0.0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.0	0.0
Advances from (to) affiliates		(346.9)	(489.5)
Net cash used in financing activities		(324.3)	(446.4)
Effect of exchange rate changes on cash and cash equivalents		0.0	0.0
Net increase (decrease) in 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	0.0
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities		47.1	17.1
Payments to Acquire Property, Plant, and Equipment		(1.3)	0.0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II			0.0
Payments for Derivative Instrument, Financing Activities		0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		(263.8)
Net cash used in investing activities		(265.1)	0.0
Proceeds from Lines of Credit		0.0
Repayments of Lines of Credit		0.0
Repayments of long-term debt		(14.5)	0.0
Proceeds from Issuance of Long-term Debt		0.0	0.0
Repayments of Long-term Debt		0.0	0.0
Payments of Financing Costs		0.0	0.0
Net change in accounts payable-inventory financing		0.0	0.0
Proceeds from stock option exercises		0.0	0.0
Proceeds from Coworker Stock Purchase Plan		0.0	0.0
Stock Repurchased and Retired During Period, Value		0.0
Payments of Ordinary Dividends, Common Stock		0.0	0.0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.0	0.0
Advances from (to) affiliates		263.6	0.5
Net cash used in financing activities		249.1	0.5
Effect of exchange rate changes on cash and cash equivalents		(3.8)	(1.1)
Net increase (decrease) in cash and cash equivalents		27.3	16.5
Cash and cash equivalents - beginning of period		24.6	14.0
Cash and cash equivalents - end of period	30.5	51.9	30.5
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities		0.0	0.0
Payments to Acquire Property, Plant, and Equipment		0.0	0.0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II			0.0
Payments for Derivative Instrument, Financing Activities		0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Net cash used in investing activities		0.0	0.0
Proceeds from Lines of Credit		0.0
Repayments of Lines of Credit		0.0
Repayments of long-term debt		0.0	0.0
Proceeds from Issuance of Long-term Debt		0.0	0.0
Repayments of Long-term Debt		0.0	0.0
Payments of Financing Costs		0.0	0.0
Net change in accounts payable-inventory financing		0.0	0.0
Proceeds from stock option exercises		0.0	0.0
Proceeds from Coworker Stock Purchase Plan		0.0	0.0
Stock Repurchased and Retired During Period, Value		0.0
Payments of Ordinary Dividends, Common Stock		0.0	0.0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.0	0.0
Advances from (to) affiliates		0.0	0.0
Net cash used in financing activities		0.0	0.0
Effect of exchange rate changes on cash and cash equivalents		0.0	0.0
Net increase (decrease) in 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	0.0
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities		(47.7)	9.7
Payments to Acquire Property, Plant, and Equipment		0.0	0.0
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II			0.0
Payments for Derivative Instrument, Financing Activities		0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Net cash used in investing activities		0.0	0.0
Proceeds from Lines of Credit		0.0
Repayments of Lines of Credit		0.0
Repayments of long-term debt		0.0	0.0
Proceeds from Issuance of Long-term Debt		0.0	0.0
Repayments of Long-term Debt		0.0	0.0
Payments of Financing Costs		0.0	0.0
Net change in accounts payable-inventory financing		0.0	0.0
Proceeds from stock option exercises		0.0	0.0
Proceeds from Coworker Stock Purchase Plan		0.0	0.0
Stock Repurchased and Retired During Period, Value		0.0
Payments of Ordinary Dividends, Common Stock		0.0	0.0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.0	0.0
Advances from (to) affiliates		73.7	0.0
Net cash used in financing activities		73.7	0.0
Effect of exchange rate changes on cash and cash equivalents		0.0	0.0
Net increase (decrease) in cash and cash equivalents		26.0	9.7
Cash and cash equivalents - beginning of period		(26.5)	(22.4)
Cash and cash equivalents - end of period	(12.7)	(0.5)	(12.7)
Consolidated [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities		294.9	350.5
Payments to Acquire Property, Plant, and Equipment		(43.9)	(34.4)
Payment of accrued charitable contribution related to the MPK Coworker Incentive Plan II			20.9
Payments for Derivative Instrument, Financing Activities		(0.5)	(0.7)
Payments to Acquire Businesses, Net of Cash Acquired		(263.8)
Net cash used in investing activities		(308.2)	(56.0)
Proceeds from Lines of Credit		105.0
Repayments of Lines of Credit		(105.0)
Repayments of long-term debt		(26.1)	(11.6)
Proceeds from Issuance of Long-term Debt		525.0	600.0
Repayments of Long-term Debt		(525.3)	(723.9)
Payments of Financing Costs		(6.8)	(14.4)
Net change in accounts payable-inventory financing		22.6	43.1
Proceeds from stock option exercises		1.7	1.1
Proceeds from Coworker Stock Purchase Plan		6.5	3.7
Stock Repurchased and Retired During Period, Value		(193.3)
Payments of Ordinary Dividends, Common Stock		(34.6)	(21.9)
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.4	0.2
Advances from (to) affiliates		0.0	0.0
Net cash used in financing activities		(229.9)	(123.7)
Effect of exchange rate changes on cash and cash equivalents		(3.8)	(1.1)
Net increase (decrease) in cash and cash equivalents		(247.0)	169.7
Cash and cash equivalents - beginning of period		344.5	188.1
Cash and cash equivalents - end of period	$ 357.8	$ 97.5	$ 357.8