Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Supplemental Condensed Consolidating Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries [Abstract]
Parent company's percentage ownership of guarantors (as a percent)	100.00%
Assets
Cash and cash equivalents	$ 132.5	$ 153.7	$ 73.5	$ 109.0
Restricted cash	12.1	10.9
Accounts receivable, net	297.3	346.0
Notes receivable, net	128.1	158.7
Inventories	170.9	137.8
Other current assets	109.1	150.3
Property and equipment, net	739.6	773.1
Investment in subsidiaries	0	0
Goodwill	1,168.7	1,183.1		801.4
Intangible assets, net	500.3	411.1
Intercompany balances	0	0
Software, net	306.8	343.5
Other assets	473.5	568.2
Total assets	4,038.9	4,236.4
Liabilities and stockholders' equity
Debt payments due within one year	30.9	30.4
Other current liabilities	361.2	421.2
Long-term debt, excluding current installments	3,178.4	3,162.2
Other long-term liabilities	362.7	247.6
Intercompany balances	0	0
Stockholders’ equity	105.7	375.0
Total liabilities and stockholders’ equity	4,038.9	4,236.4
Parent Company
Assets
Cash and cash equivalents	36.4	56.0	17.0	27.2
Restricted cash	0	0
Accounts receivable, net	0	0
Notes receivable, net	0	0
Inventories	0	0
Other current assets	14.6	13.9
Property and equipment, net	0.5	1.1
Investment in subsidiaries	1,849.5	1,962.5
Goodwill	0	0
Intangible assets, net	161.1	1.9
Intercompany balances	0	0
Software, net	12.7	9.4
Other assets	3.1	6.0
Total assets	2,077.9	2,050.8
Liabilities and stockholders' equity
Debt payments due within one year	0	0
Other current liabilities	39.7	30.4
Long-term debt, excluding current installments	250.0	250.0
Other long-term liabilities	179.8	20.8
Intercompany balances	1,502.7	1,374.6
Stockholders’ equity	105.7	375.0
Total liabilities and stockholders’ equity	2,077.9	2,050.8
SGI
Assets
Cash and cash equivalents	0.3	0	0.2	0.2
Restricted cash	0	0
Accounts receivable, net	62.3	66.9
Notes receivable, net	0	0
Inventories	40.7	28.2
Other current assets	14.4	10.5
Property and equipment, net	125.7	137.3
Investment in subsidiaries	952.6	796.5
Goodwill	253.6	251.7
Intangible assets, net	42.4	42.0
Intercompany balances	1,413.0	1,430.1
Software, net	33.2	31.7
Other assets	116.4	147.7
Total assets	3,054.6	2,942.6
Liabilities and stockholders' equity
Debt payments due within one year	23.0	23.0
Other current liabilities	77.5	63.2
Long-term debt, excluding current installments	2,897.6	2,912.2
Other long-term liabilities	45.9	37.8
Intercompany balances	0	0
Stockholders’ equity	10.6	(93.6)
Total liabilities and stockholders’ equity	3,054.6	2,942.6
Guarantor Subsidiaries
Assets
Cash and cash equivalents	11.3	24.4	(2.0)	2.4
Restricted cash	12.0	10.9
Accounts receivable, net	117.1	135.4
Notes receivable, net	71.5	90.9
Inventories	60.1	59.6
Other current assets	51.6	95.0
Property and equipment, net	410.2	441.8
Investment in subsidiaries	0	0
Goodwill	480.5	465.4
Intangible assets, net	284.8	340.6
Intercompany balances	343.4	296.3
Software, net	211.2	251.4
Other assets	26.3	42.2
Total assets	2,080.0	2,253.9
Liabilities and stockholders' equity
Debt payments due within one year	0	0
Other current liabilities	117.0	176.2
Long-term debt, excluding current installments	0	0
Other long-term liabilities	69.7	121.2
Intercompany balances	0	0
Stockholders’ equity	1,893.3	1,956.5
Total liabilities and stockholders’ equity	2,080.0	2,253.9
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	84.5	73.3	58.3	79.2
Restricted cash	0.1	0
Accounts receivable, net	117.9	143.7
Notes receivable, net	56.6	67.8
Inventories	70.1	50.0
Other current assets	28.5	30.9
Property and equipment, net	203.2	192.9
Investment in subsidiaries	0	0
Goodwill	434.6	466.0
Intangible assets, net	12.0	26.6
Intercompany balances	0	0
Software, net	49.7	51.0
Other assets	327.7	372.3
Total assets	1,384.9	1,474.5
Liabilities and stockholders' equity
Debt payments due within one year	7.9	7.4
Other current liabilities	127.0	151.4
Long-term debt, excluding current installments	30.8	0
Other long-term liabilities	67.3	67.8
Intercompany balances	253.7	351.8
Stockholders’ equity	898.2	896.1
Total liabilities and stockholders’ equity	1,384.9	1,474.5
Eliminating Entries
Assets
Cash and cash equivalents	0	0	0	0
Restricted cash	0	0
Accounts receivable, net	0	0
Notes receivable, net	0	0
Inventories	0	0
Other current assets	0	0
Property and equipment, net	0	0
Investment in subsidiaries	(2,802.1)	(2,759.0)
Goodwill	0	0
Intangible assets, net	0	0
Intercompany balances	(1,756.4)	(1,726.4)
Software, net	0	0
Other assets	0	0
Total assets	(4,558.5)	(4,485.4)
Liabilities and stockholders' equity
Debt payments due within one year	0	0
Other current liabilities	0	0
Long-term debt, excluding current installments	0	0
Other long-term liabilities	0	0
Intercompany balances	(1,756.4)	(1,726.4)
Stockholders’ equity	(2,802.1)	(2,759.0)
Total liabilities and stockholders’ equity	$ (4,558.5)	$ (4,485.4)