SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Cash Flows)(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 603.2	$ 217.1	$ 159.2
Payments to Acquire Property, Plant, and Equipment	(278.0)	(130.9)	(71.8)
Business acquired and related transactions, net of cash acquired	(69.5)	(408.1)	0.0
Payments under long-term supply contract	(175.7)	0.0	0.0
Proceeds from sale/leaseback of equipment	40.4		0.0
Proceeds from disposition of property, plant and equipment	0.5	26.2	5.6
Increase (Decrease) in Restricted Cash	0.0	0.0	4.2
Proceeds from Contributions from Affiliates	8.8	8.8	0.0
Payments for (Proceeds from) Other Investing Activities	0.0	0.0	0.3
Net Cash Provided by (Used in) Investing Activities	(473.5)	(504.0)	(61.7)
Borrowings	230.0	1,275.0	150.0
Long-term debt repayments	(435.3)	(730.7)	(162.4)
Financing portion of earn out payment - SunBelt	0.0	0.0	(14.8)
Payments for Repurchase of Common Stock	0.0	0.0	(64.8)
Stock options exercised	0.5	2.2	6.6
Excess tax benefits from stock-based compensation	0.4	0.4	1.1
Payments of Dividends	(132.1)	(79.5)	(63.0)
Debt and equity issuance costs	(1.0)	(45.2)	(1.2)
Intercompany Financing Activities	0.0	0.0	0.0
Net Cash Provided by (Used in) Financing Activities	(337.5)	422.2	(148.5)
Effect of exchange rate changes on cash and cash equivalents	0.3	(0.1)	0.0
Cash and Cash Equivalents, Period Increase (Decrease)	(207.5)	135.2	(51.0)
Cash and cash equivalents, end of year	184.5	392.0	256.8
Parent Guarantor
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	702.6	(70.6)	134.7
Payments to Acquire Property, Plant, and Equipment	(65.7)	(74.0)	(51.3)
Business acquired and related transactions, net of cash acquired	(69.5)	(408.1)
Payments under long-term supply contract	0.0
Proceeds from sale/leaseback of equipment	0.0
Proceeds from disposition of property, plant and equipment	0.2	1.7	3.5
Increase (Decrease) in Restricted Cash			4.2
Proceeds from Contributions from Affiliates	8.8	8.8
Payments for (Proceeds from) Other Investing Activities			0.0
Net Cash Provided by (Used in) Investing Activities	(126.2)	(471.6)	(43.6)
Borrowings	0.0	1,275.0	150.0
Long-term debt repayments	(335.6)	(149.5)	(150.2)
Financing portion of earn out payment - SunBelt			0.0
Payments for Repurchase of Common Stock			(64.8)
Stock options exercised	0.5	2.2	6.6
Excess tax benefits from stock-based compensation	0.4	0.4	1.1
Payments of Dividends	(132.1)	(79.5)	(63.0)
Debt and equity issuance costs	0.0	(35.2)	(1.2)
Intercompany Financing Activities	(203.8)	(591.2)	(27.0)
Net Cash Provided by (Used in) Financing Activities	(670.6)	422.2	(148.5)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Cash and Cash Equivalents, Period Increase (Decrease)	(94.2)	(120.0)	(57.4)
Cash and cash equivalents, end of year	25.2	119.4	239.4
Issuer
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	0.0	0.0	0.0
Payments to Acquire Property, Plant, and Equipment	0.0	0.0	0.0
Business acquired and related transactions, net of cash acquired	0.0	0.0
Payments under long-term supply contract	0.0
Proceeds from sale/leaseback of equipment	0.0
Proceeds from disposition of property, plant and equipment	0.0	0.0	0.0
Increase (Decrease) in Restricted Cash			0.0
Proceeds from Contributions from Affiliates	0.0	0.0
Payments for (Proceeds from) Other Investing Activities			0.0
Net Cash Provided by (Used in) Investing Activities	0.0	0.0	0.0
Borrowings	0.0	0.0	0.0
Long-term debt repayments	(67.5)	0.0	0.0
Financing portion of earn out payment - SunBelt			0.0
Payments for Repurchase of Common Stock			0.0
Stock options exercised	0.0	0.0	0.0
Excess tax benefits from stock-based compensation	0.0	0.0	0.0
Payments of Dividends	0.0	0.0	0.0
Debt and equity issuance costs	(1.0)	(10.0)	0.0
Intercompany Financing Activities	68.5	10.0
Net Cash Provided by (Used in) Financing Activities	0.0	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Cash and Cash Equivalents, Period Increase (Decrease)	0.0	0.0	0.0
Cash and cash equivalents, end of year	0.0	0.0	0.0
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	(99.4)	287.7	24.5
Payments to Acquire Property, Plant, and Equipment	(212.3)	(56.9)	(20.5)
Business acquired and related transactions, net of cash acquired	0.0	0.0
Payments under long-term supply contract	(175.7)
Proceeds from sale/leaseback of equipment	40.4
Proceeds from disposition of property, plant and equipment	0.3	24.5	2.1
Increase (Decrease) in Restricted Cash			0.0
Proceeds from Contributions from Affiliates	0.0	0.0
Payments for (Proceeds from) Other Investing Activities			0.3
Net Cash Provided by (Used in) Investing Activities	(347.3)	(32.4)	(18.1)
Borrowings	230.0	0.0	0.0
Long-term debt repayments	(32.2)	(581.2)	(12.2)
Financing portion of earn out payment - SunBelt			(14.8)
Payments for Repurchase of Common Stock			0.0
Stock options exercised	0.0	0.0	0.0
Excess tax benefits from stock-based compensation	0.0	0.0	0.0
Payments of Dividends	0.0	0.0	0.0
Debt and equity issuance costs	0.0	0.0	0.0
Intercompany Financing Activities	135.3	581.2	27.0
Net Cash Provided by (Used in) Financing Activities	333.1	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.3	(0.1)
Cash and Cash Equivalents, Period Increase (Decrease)	(113.3)	255.2	6.4
Cash and cash equivalents, end of year	159.3	272.6	17.4
Eliminations
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	0.0	0.0	0.0
Payments to Acquire Property, Plant, and Equipment	0.0	0.0	0.0
Business acquired and related transactions, net of cash acquired	0.0	0.0
Payments under long-term supply contract	0.0
Proceeds from sale/leaseback of equipment	0.0
Proceeds from disposition of property, plant and equipment	0.0	0.0	0.0
Increase (Decrease) in Restricted Cash			0.0
Proceeds from Contributions from Affiliates	0.0	0.0
Payments for (Proceeds from) Other Investing Activities			0.0
Net Cash Provided by (Used in) Investing Activities	0.0	0.0	0.0
Borrowings	0.0	0.0	0.0
Long-term debt repayments	0.0	0.0	0.0
Financing portion of earn out payment - SunBelt			0.0
Payments for Repurchase of Common Stock			0.0
Stock options exercised	0.0	0.0	0.0
Excess tax benefits from stock-based compensation	0.0	0.0	0.0
Payments of Dividends	0.0	0.0	0.0
Debt and equity issuance costs	0.0	0.0	0.0
Intercompany Financing Activities	0.0
Net Cash Provided by (Used in) Financing Activities	0.0	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Cash and Cash Equivalents, Period Increase (Decrease)	0.0	0.0	0.0
Cash and cash equivalents, end of year	$ 0.0	$ 0.0	$ 0.0