SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Balance Sheet)(Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	$ 184.5	$ 184.5	$ 66.6	$ 392.0
Receivables, net	782.2	675.0	790.5
Intercompany receivables	0.0	0.0	0.0
Income taxes receivable	20.9	25.5	45.8
Inventories	666.2	630.4	636.2
Other Assets, Current	37.2	30.8	23.8
Total current assets	1,691.0	1,546.2	1,562.9
Property, Plant and Equipment, Net	3,627.4	3,704.9	3,793.3
Investment in subsidiaries	0.0	0.0	0.0
Deferred income taxes	125.2	119.5	107.0
Other Assets, Noncurrent	625.6	644.4	588.6
Long-term receivables—affiliates	0.0	0.0	0.0
Intangible Assets, Net	605.6	629.6	671.2
Goodwill	2,119.5	2,118.0	2,186.3	2,174.1
Total assets	8,794.3	8,762.6	8,909.3
Current installments of long-term debt	81.7	80.5	80.3
Accounts payable	656.1	570.8	536.4
Intercompany payables	0.0	0.0	0.0
Income taxes payable	7.1	7.5	8.2
Accrued Liabilities, Current	261.5	263.8	293.6
Total current liabilities	1,006.4	922.6	918.5
Long-term Debt, Excluding Current Maturities	3,518.9	3,537.1	3,615.5
Accrued pension liability	625.6	638.1	616.7
Deferred income taxes	1,037.6	1,032.5	1,079.3
Long-term payables—affiliates	0.0	0.0	0.0
Other Liabilities, Noncurrent	347.2	359.3	348.3
Total liabilities	6,535.7	6,489.6	6,578.3
Commitments and contingencies
Common Stock, Value, Issued	166.3	165.4	165.2
Additional Paid in Capital, Common Stock	2,262.7	2,243.8	2,240.3
Accumulated other comprehensive loss	(485.4)	(510.0)	(479.3)	(492.5)
Retained Earnings (Accumulated Deficit)	315.0	373.8	404.8
Total shareholders' equity	2,258.6	2,273.0	2,331.0	2,418.8
Total liabilities and shareholders' equity	8,794.3	8,762.6	8,909.3
Parent Guarantor
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	28.9	25.2	23.2	119.4
Receivables, net	101.7	88.3	98.2
Intercompany receivables	0.0	0.0	0.0
Income taxes receivable	18.8	19.0	35.1
Inventories	178.2	167.7	175.2
Other Assets, Current	183.1	164.7	146.1
Total current assets	510.7	464.9	477.8
Property, Plant and Equipment, Net	509.1	510.1	494.7
Investment in subsidiaries	6,082.7	6,035.2	5,957.3
Deferred income taxes	151.8	133.5	166.2
Other Assets, Noncurrent	46.9	48.1	40.4
Long-term receivables—affiliates	0.0	0.0	0.0
Intangible Assets, Net	0.4	0.4	0.5
Goodwill	0.0	0.0	0.0
Total assets	7,301.6	7,192.2	7,136.9
Current installments of long-term debt	0.8	0.6	0.6
Accounts payable	58.0	45.3	59.8
Intercompany payables	2,055.8	1,882.8	1,734.4
Income taxes payable	0.0	0.0	0.6
Accrued Liabilities, Current	116.1	124.9	133.4
Total current liabilities	2,230.7	2,053.6	1,928.8
Long-term Debt, Excluding Current Maturities	822.3	913.9	1,158.3
Accrued pension liability	421.7	453.7	164.1
Deferred income taxes	0.0	0.0	0.0
Long-term payables—affiliates	1,284.4	1,209.1	1,277.3
Other Liabilities, Noncurrent	283.9	288.9	277.4
Total liabilities	5,043.0	4,919.2	4,805.9
Common Stock, Value, Issued	166.3	165.4	165.2
Additional Paid in Capital, Common Stock	2,262.7	2,243.8	2,240.3
Accumulated other comprehensive loss	(485.4)	(510.0)	(479.3)
Retained Earnings (Accumulated Deficit)	315.0	373.8	404.8
Total shareholders' equity	2,258.6	2,273.0	2,331.0
Total liabilities and shareholders' equity	7,301.6	7,192.2	7,136.9
Issuer
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	0.0	0.0	0.0	0.0
Receivables, net	0.0	0.0	0.0
Intercompany receivables	2.9	0.0	22.3
Income taxes receivable	0.0	0.0	0.0
Inventories	0.0	0.0	0.0
Other Assets, Current	0.0	3.4	0.0
Total current assets	2.9	3.4	22.3
Property, Plant and Equipment, Net	0.0	0.0	0.0
Investment in subsidiaries	3,774.0	3,734.7	3,655.0
Deferred income taxes	0.0	0.0	0.0
Other Assets, Noncurrent	0.0	0.0	0.0
Long-term receivables—affiliates	2,204.3	2,194.2	2,262.4
Intangible Assets, Net	5.7	5.7	5.7
Goodwill	966.3	966.3	994.2
Total assets	6,953.2	6,904.3	6,939.6
Current installments of long-term debt	68.8	67.5	67.5
Accounts payable	0.0	0.0	0.0
Intercompany payables	0.0	29.5	0.0
Income taxes payable	0.0	0.0	0.0
Accrued Liabilities, Current	0.0	0.0	0.0
Total current liabilities	68.8	97.0	67.5
Long-term Debt, Excluding Current Maturities	2,487.4	2,413.3	2,444.8
Accrued pension liability	0.0	0.0	0.0
Deferred income taxes	237.9	223.6	294.7
Long-term payables—affiliates	0.0	0.0	0.0
Other Liabilities, Noncurrent	8.1	6.6	0.0
Total liabilities	2,802.2	2,740.5	2,807.0
Common Stock, Value, Issued	0.0	0.0	0.0
Additional Paid in Capital, Common Stock	4,125.7	4,125.7	4,125.7
Accumulated other comprehensive loss	0.0	0.0	0.0
Retained Earnings (Accumulated Deficit)	25.3	38.1	6.9
Total shareholders' equity	4,151.0	4,163.8	4,132.6
Total liabilities and shareholders' equity	6,953.2	6,904.3	6,939.6
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	155.6	159.3	43.4	272.6
Receivables, net	680.5	586.7	692.3
Intercompany receivables	2,052.9	1,912.3	1,712.1
Income taxes receivable	7.2	7.3	10.7
Inventories	488.0	462.7	461.0
Other Assets, Current	7.0	1.2	5.4
Total current assets	3,391.2	3,129.5	2,924.9
Property, Plant and Equipment, Net	3,118.3	3,194.8	3,298.6
Investment in subsidiaries	0.0	0.0	0.0
Deferred income taxes	97.8	103.5	88.5
Other Assets, Noncurrent	578.7	596.3	548.2
Long-term receivables—affiliates	0.0	0.0	0.0
Intangible Assets, Net	599.5	623.5	665.0
Goodwill	1,153.2	1,151.7	1,192.1
Total assets	8,938.7	8,799.3	8,717.3
Current installments of long-term debt	12.1	12.4	12.2
Accounts payable	603.7	527.4	476.6
Intercompany payables	0.0	0.0	0.0
Income taxes payable	12.2	8.3	7.6
Accrued Liabilities, Current	296.6	277.5	287.9
Total current liabilities	924.6	825.6	784.3
Long-term Debt, Excluding Current Maturities	209.2	209.9	12.4
Accrued pension liability	203.9	184.4	452.6
Deferred income taxes	924.1	926.4	932.3
Long-term payables—affiliates	919.9	985.1	985.1
Other Liabilities, Noncurrent	55.2	63.8	70.9
Total liabilities	3,236.9	3,195.2	3,237.6
Common Stock, Value, Issued	14.6	14.6	15.1
Additional Paid in Capital, Common Stock	4,808.2	4,808.2	4,756.4
Accumulated other comprehensive loss	(8.6)	(7.0)	(21.1)
Retained Earnings (Accumulated Deficit)	887.6	788.3	729.3
Total shareholders' equity	5,701.8	5,604.1	5,479.7
Total liabilities and shareholders' equity	8,938.7	8,799.3	8,717.3
Eliminations
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	0.0	0.0	0.0	$ 0.0
Receivables, net	0.0	0.0	0.0
Intercompany receivables	(2,055.8)	(1,912.3)	(1,734.4)
Income taxes receivable	(5.1)	(0.8)	0.0
Inventories	0.0	0.0	0.0
Other Assets, Current	(152.9)	(138.5)	(127.7)
Total current assets	(2,213.8)	(2,051.6)	(1,862.1)
Property, Plant and Equipment, Net	0.0	0.0	0.0
Investment in subsidiaries	(9,856.7)	(9,769.9)	(9,612.3)
Deferred income taxes	(124.4)	(117.5)	(147.7)
Other Assets, Noncurrent	0.0	0.0	0.0
Long-term receivables—affiliates	(2,204.3)	(2,194.2)	(2,262.4)
Intangible Assets, Net	0.0	0.0	0.0
Goodwill	0.0	0.0	0.0
Total assets	(14,399.2)	(14,133.2)	(13,884.5)
Current installments of long-term debt	0.0	0.0	0.0
Accounts payable	(5.6)	(1.9)	0.0
Intercompany payables	(2,055.8)	(1,912.3)	(1,734.4)
Income taxes payable	(5.1)	(0.8)	0.0
Accrued Liabilities, Current	(151.2)	(138.6)	(127.7)
Total current liabilities	(2,217.7)	(2,053.6)	(1,862.1)
Long-term Debt, Excluding Current Maturities	0.0	0.0	0.0
Accrued pension liability	0.0	0.0	0.0
Deferred income taxes	(124.4)	(117.5)	(147.7)
Long-term payables—affiliates	(2,204.3)	(2,194.2)	(2,262.4)
Other Liabilities, Noncurrent	0.0	0.0	0.0
Total liabilities	(4,546.4)	(4,365.3)	(4,272.2)
Common Stock, Value, Issued	(14.6)	(14.6)	(15.1)
Additional Paid in Capital, Common Stock	(8,933.9)	(8,933.9)	(8,882.1)
Accumulated other comprehensive loss	8.6	7.0	21.1
Retained Earnings (Accumulated Deficit)	(912.9)	(826.4)	(736.2)
Total shareholders' equity	(9,852.8)	(9,767.9)	(9,612.3)
Total liabilities and shareholders' equity	$ (14,399.2)	$ (14,133.2)	$ (13,884.5)