Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Supplemental Condensed Consolidating Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 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	$ 89.2	$ 153.7	$ 78.1	$ 109.0
Restricted cash	11.8	10.9
Accounts receivable, net	326.5	346.0
Notes receivable, net	135.0	158.7
Inventories	170.3	137.8
Other current assets	146.4	154.4
Property and equipment, net	766.8	772.6
Investment in subsidiaries	0	0
Goodwill	1,197.8	1,186.9		801.4
Intangible assets, net	510.3	411.1
Intercompany balances	0	0
Software, net	321.1	343.5
Other assets	508.3	566.3
Total assets	4,183.5	4,241.9
Liabilities and stockholders' equity
Debt payments due within one year	36.2	30.4
Other current liabilities	364.0	426.7
Long-term debt, excluding current installments	3,187.5	3,162.2
Other long-term liabilities	369.9	247.6
Intercompany balances	0	0
Stockholders’ equity	225.9	375.0
Total liabilities and stockholders’ equity	4,183.5	4,241.9
Parent Company
Assets
Cash and cash equivalents	16.3	56.0	16.1	27.2
Restricted cash	0	0
Accounts receivable, net	0	0
Notes receivable, net	0	0
Inventories	0	0
Other current assets	13.9	13.9
Property and equipment, net	0.6	1.1
Investment in subsidiaries	1,933.4	1,962.5
Goodwill	0	0
Intangible assets, net	161.9	1.9
Intercompany balances	0	0
Software, net	10.5	9.4
Other assets	3.3	6.0
Total assets	2,139.9	2,050.8
Liabilities and stockholders' equity
Debt payments due within one year	0	0
Other current liabilities	41.3	30.4
Long-term debt, excluding current installments	250.0	250.0
Other long-term liabilities	179.7	20.8
Intercompany balances	1,443.0	1,374.6
Stockholders’ equity	225.9	375.0
Total liabilities and stockholders’ equity	2,139.9	2,050.8
SGI
Assets
Cash and cash equivalents	0.1	0	0	0.1
Restricted cash	0	0
Accounts receivable, net	66.8	66.9
Notes receivable, net	0	0
Inventories	39.3	28.2
Other current assets	14.5	10.5
Property and equipment, net	129.4	137.3
Investment in subsidiaries	957.3	796.5
Goodwill	253.6	251.7
Intangible assets, net	41.5	42.0
Intercompany balances	1,408.0	1,430.1
Software, net	33.6	31.7
Other assets	129.1	147.7
Total assets	3,073.2	2,942.6
Liabilities and stockholders' equity
Debt payments due within one year	23.0	23.0
Other current liabilities	71.5	63.2
Long-term debt, excluding current installments	2,902.9	2,912.2
Other long-term liabilities	44.5	37.8
Intercompany balances	0	0
Stockholders’ equity	31.3	(93.6)
Total liabilities and stockholders’ equity	3,073.2	2,942.6
Guarantor Subsidiaries
Assets
Cash and cash equivalents	1.3	24.4	1.9	2.4
Restricted cash	11.7	10.9
Accounts receivable, net	138.1	135.4
Notes receivable, net	77.7	90.9
Inventories	64.8	59.6
Other current assets	82.8	95.0
Property and equipment, net	418.5	441.3
Investment in subsidiaries	0	0
Goodwill	484.2	464.6
Intangible assets, net	281.9	340.6
Intercompany balances	286.8	296.3
Software, net	227.6	251.4
Other assets	28.3	42.2
Total assets	2,103.7	2,252.6
Liabilities and stockholders' equity
Debt payments due within one year	0	0
Other current liabilities	123.6	174.9
Long-term debt, excluding current installments	0	0
Other long-term liabilities	73.2	121.2
Intercompany balances	0	0
Stockholders’ equity	1,906.9	1,956.5
Total liabilities and stockholders’ equity	2,103.7	2,252.6
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	71.5	73.3	60.1	79.3
Restricted cash	0.1	0
Accounts receivable, net	121.6	143.7
Notes receivable, net	57.3	67.8
Inventories	66.2	50.0
Other current assets	35.2	35.0
Property and equipment, net	218.3	192.9
Investment in subsidiaries	0	0
Goodwill	460.0	470.6
Intangible assets, net	25.0	26.6
Intercompany balances	0	0
Software, net	49.4	51.0
Other assets	347.6	370.4
Total assets	1,452.2	1,481.3
Liabilities and stockholders' equity
Debt payments due within one year	13.2	7.4
Other current liabilities	127.7	158.2
Long-term debt, excluding current installments	34.6	0
Other long-term liabilities	72.5	67.8
Intercompany balances	251.8	351.8
Stockholders’ equity	952.4	896.1
Total liabilities and stockholders’ equity	1,452.2	1,481.3
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	(2,890.7)	(2,759.0)
Goodwill	0	0
Intangible assets, net	0	0
Intercompany balances	(1,694.8)	(1,726.4)
Software, net	0	0
Other assets	0	0
Total assets	(4,585.5)	(4,485.4)
Liabilities and stockholders' equity
Debt payments due within one year	0	0
Other current liabilities	(0.1)	0
Long-term debt, excluding current installments	0	0
Other long-term liabilities	0	0
Intercompany balances	(1,694.8)	(1,726.4)
Stockholders’ equity	(2,890.6)	(2,759.0)
Total liabilities and stockholders’ equity	$ (4,585.5)	$ (4,485.4)