Supplemental Guarantor Information -Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	$ 97.5	$ 344.5	$ 357.8	$ 188.1
Accounts receivable, net of allowance for doubtful accounts	1,860.0	1,561.1
Merchandise inventory	411.4	337.5
Miscellaneous receivables	230.6	155.6
Prepaid expenses and other	135.4	54.7
Total current assets	2,734.9	2,453.4
Property and equipment, net	154.4	137.2
Equity Method Investments	0.0	86.7
Goodwill	2,517.4	2,217.6
Other intangible assets, net	1,325.4	1,168.8
Deferred financing costs, net	28.0	26.4
Other assets	9.4	12.2
Total assets	6,741.5	6,075.9
Accounts payable-trade	1,012.7	704.0
Accounts payable-inventory financing	354.7	332.1
Current maturities of long-term debt	27.5	15.4
Deferred revenue	126.4	81.3
Total current liabilities	1,871.9	1,468.0
Long-term Debt, Excluding Current Maturities	3,240.3	3,150.6
Deferred income taxes	495.9	475.0
Other liabilities	57.7	45.8
Total long-term liabilities	3,793.9	3,671.4
Total shareholders' equity (deficit)	1,075.7	936.5
Total liabilities and shareholders' equity (deficit)	6,741.5	6,075.9
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable, net of allowance for doubtful accounts	0.0	0.0
Merchandise inventory	0.0	0.0
Miscellaneous receivables	0.0	0.0
Prepaid expenses and other	0.0	0.0
Total current assets	0.0	0.0
Property and equipment, net	0.0	0.0
Equity Method Investments	0.0	0.0
Goodwill	0.0	0.0
Other intangible assets, net	0.0	0.0
Other assets	3.8	4.3
Investment from and advances to subsidiaries	1,071.9	932.2
Total assets	1,075.7	936.5
Accounts payable-trade	0.0	0.0
Accounts payable-inventory financing	0.0	0.0
Current maturities of long-term debt	0.0	0.0
Deferred revenue	0.0	0.0
Accrued Expenses	0.0	0.0
Total current liabilities	0.0	0.0
Long-term Debt, Excluding Current Maturities	0.0	0.0
Deferred income taxes	0.0	0.0
Other liabilities	0.0	0.0
Total long-term liabilities	0.0	0.0
Total shareholders' equity (deficit)	1,075.7	936.5
Total liabilities and shareholders' equity (deficit)	1,075.7	936.5
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	46.1	346.4	340.0	196.5
Accounts receivable, net of allowance for doubtful accounts	0.0	0.0
Merchandise inventory	0.0	0.0
Miscellaneous receivables	62.9	56.1
Prepaid expenses and other	15.8	11.0
Total current assets	124.8	413.5
Property and equipment, net	87.9	80.5
Equity Method Investments	0.0	86.7
Goodwill	751.8	751.8
Other intangible assets, net	306.8	320.0
Other assets	10.8	12.2
Investment from and advances to subsidiaries	3,306.9	2,784.5
Total assets	4,589.0	4,449.2
Accounts payable-trade	28.7	23.9
Accounts payable-inventory financing	0.0	0.0
Current maturities of long-term debt	15.4	15.4
Deferred revenue	0.0	0.0
Accrued Expenses	148.5	137.8
Total current liabilities	192.6	177.1
Long-term Debt, Excluding Current Maturities	3,159.3	3,150.6
Deferred income taxes	119.3	146.7
Other liabilities	45.9	42.6
Total long-term liabilities	3,324.5	3,339.9
Total shareholders' equity (deficit)	1,071.9	932.2
Total liabilities and shareholders' equity (deficit)	4,589.0	4,449.2
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable, net of allowance for doubtful accounts	1,659.1	1,479.1
Merchandise inventory	381.9	333.9
Miscellaneous receivables	147.8	93.3
Prepaid expenses and other	65.7	46.0
Total current assets	2,254.5	1,952.3
Property and equipment, net	54.5	55.5
Equity Method Investments	0.0	0.0
Goodwill	1,439.0	1,439.0
Other intangible assets, net	739.5	843.6
Other assets	262.4	0.4
Investment from and advances to subsidiaries	0.0	0.0
Total assets	4,749.9	4,290.8
Accounts payable-trade	825.3	671.9
Accounts payable-inventory financing	354.8	332.1
Current maturities of long-term debt	0.0	0.0
Deferred revenue	78.4	79.9
Accrued Expenses	170.5	193.6
Total current liabilities	1,429.0	1,277.5
Long-term Debt, Excluding Current Maturities	0.0	0.0
Deferred income taxes	286.5	331.3
Other liabilities	3.2	3.7
Total long-term liabilities	289.7	335.0
Total shareholders' equity (deficit)	3,031.2	2,678.3
Total liabilities and shareholders' equity (deficit)	4,749.9	4,290.8
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	51.9	24.6	30.5	14.0
Accounts receivable, net of allowance for doubtful accounts	200.9	82.0
Merchandise inventory	29.5	3.6
Miscellaneous receivables	20.0	6.2
Prepaid expenses and other	56.2	1.5
Total current assets	358.5	117.9
Property and equipment, net	12.0	1.2
Equity Method Investments	0.0	0.0
Goodwill	326.6	26.8
Other intangible assets, net	279.1	5.2
Other assets	3.4	1.4
Investment from and advances to subsidiaries	0.0	0.0
Total assets	979.6	152.5
Accounts payable-trade	159.2	34.7
Accounts payable-inventory financing	0.0	0.0
Current maturities of long-term debt	12.1	0.0
Deferred revenue	48.0	1.4
Accrued Expenses	34.5	7.9
Total current liabilities	253.8	44.0
Long-term Debt, Excluding Current Maturities	81.0	0.0
Deferred income taxes	94.0	1.3
Other liabilities	275.1	1.0
Total long-term liabilities	450.1	2.3
Total shareholders' equity (deficit)	275.7	106.2
Total liabilities and shareholders' equity (deficit)	979.6	152.5
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable, net of allowance for doubtful accounts	0.0	0.0
Merchandise inventory	0.0	0.0
Miscellaneous receivables	0.0	0.0
Prepaid expenses and other	0.0	0.0
Total current assets	0.0	0.0
Property and equipment, net	0.0	0.0
Equity Method Investments	0.0	0.0
Goodwill	0.0	0.0
Other intangible assets, net	0.0	0.0
Other assets	0.0	0.0
Investment from and advances to subsidiaries	0.0	0.0
Total assets	0.0	0.0
Accounts payable-trade	0.0	0.0
Accounts payable-inventory financing	0.0	0.0
Current maturities of long-term debt	0.0	0.0
Deferred revenue	0.0	0.0
Accrued Expenses	0.0	0.0
Total current liabilities	0.0	0.0
Long-term Debt, Excluding Current Maturities	0.0	0.0
Deferred income taxes	0.0	0.0
Other liabilities	0.0	0.0
Total long-term liabilities	0.0	0.0
Total shareholders' equity (deficit)	0.0	0.0
Total liabilities and shareholders' equity (deficit)	0.0	0.0
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	(0.5)	(26.5)	(12.7)	(22.4)
Accounts receivable, net of allowance for doubtful accounts	0.0	0.0
Merchandise inventory	0.0	0.0
Miscellaneous receivables	(0.1)	0.0
Prepaid expenses and other	(2.3)	(3.8)
Total current assets	(2.9)	(30.3)
Property and equipment, net	0.0	0.0
Equity Method Investments	0.0	0.0
Goodwill	0.0	0.0
Other intangible assets, net	0.0	0.0
Other assets	(271.0)	(6.1)
Investment from and advances to subsidiaries	(4,378.8)	(3,716.7)
Total assets	(4,652.7)	(3,753.1)
Accounts payable-trade	(0.5)	(26.5)
Accounts payable-inventory financing	(0.1)	0.0
Current maturities of long-term debt	0.0	0.0
Deferred revenue	0.0	0.0
Accrued Expenses	(2.9)	(4.1)
Total current liabilities	(3.5)	(30.6)
Long-term Debt, Excluding Current Maturities	0.0	0.0
Deferred income taxes	(3.9)	(4.3)
Other liabilities	(266.5)	(1.5)
Total long-term liabilities	(270.4)	(5.8)
Total shareholders' equity (deficit)	(4,378.8)	(3,716.7)
Total liabilities and shareholders' equity (deficit)	(4,652.7)	(3,753.1)
Consolidated [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	97.5	344.5	$ 357.8	$ 188.1
Accounts receivable, net of allowance for doubtful accounts	1,860.0	1,561.1
Merchandise inventory	411.4	337.5
Miscellaneous receivables	230.6	155.6
Prepaid expenses and other	135.4	54.7
Total current assets	2,734.9	2,453.4
Property and equipment, net	154.4	137.2
Equity Method Investments	0.0	86.7
Goodwill	2,517.4	2,217.6
Other intangible assets, net	1,325.4	1,168.8
Other assets	9.4	12.2
Investment from and advances to subsidiaries	0.0	0.0
Total assets	6,741.5	6,075.9
Accounts payable-trade	1,012.7	704.0
Accounts payable-inventory financing	354.7	332.1
Current maturities of long-term debt	27.5	15.4
Deferred revenue	126.4	81.3
Accrued Expenses	350.6	335.2
Total current liabilities	1,871.9	1,468.0
Long-term Debt, Excluding Current Maturities	3,240.3	3,150.6
Deferred income taxes	495.9	475.0
Other liabilities	57.7	45.8
Total long-term liabilities	3,793.9	3,671.4
Total shareholders' equity (deficit)	1,075.7	936.5
Total liabilities and shareholders' equity (deficit)	$ 6,741.5	$ 6,075.9