Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Supplemental Condensed Consolidating Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 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	$ 169.1	$ 153.7	$ 90.0	$ 109.0
Restricted cash	11.8	10.9
Accounts receivable, net	317.8	346.0
Notes receivable, net	143.9	158.7
Inventories	163.2	137.8
Other current assets	147.5	154.4
Property and equipment, net	765.6	772.6
Investment in subsidiaries	0	0
Goodwill	1,190.4	1,186.9		801.4
Intangible assets, net	512.8	411.1
Intercompany balances	0	0
Software, net	329.0	343.5
Other assets	509.0	566.3
Total assets	4,260.1	4,241.9
Liabilities and stockholders' equity
Debt payments due within one year	32.9	30.4
Other current liabilities	410.2	426.7
Long-term debt, excluding current installments	3,168.3	3,162.2
Other non-current liabilities	362.8	247.6
Intercompany balances	0	0
Stockholders’ equity	285.9	375.0
Total liabilities and stockholders’ equity	4,260.1	4,241.9
Parent Company
Assets
Cash and cash equivalents	42.7	56.0
Restricted cash	0	0
Accounts receivable, net	0	0
Notes receivable, net	0	0
Inventories	0	0
Other current assets	13.3	13.9
Property and equipment, net	2.0	1.1
Investment in subsidiaries	1,961.8	1,962.5
Goodwill	0	0
Intangible assets, net	2.8	1.9
Intercompany balances	0	0
Software, net	6.8	9.4
Other assets	3.8	6.0
Total assets	2,033.2	2,050.8
Liabilities and stockholders' equity
Debt payments due within one year	0	0
Other current liabilities	26.8	30.4
Long-term debt, excluding current installments	250.0	250.0
Other non-current liabilities	21.7	20.8
Intercompany balances	1,448.8	1,374.6
Stockholders’ equity	285.9	375.0
Total liabilities and stockholders’ equity	2,033.2	2,050.8
SGI
Assets
Cash and cash equivalents	0.2	0
Restricted cash	0	0
Accounts receivable, net	68.8	66.9
Notes receivable, net	0	0
Inventories	38.8	28.2
Other current assets	11.0	10.5
Property and equipment, net	132.9	137.3
Investment in subsidiaries	949.6	796.5
Goodwill	253.6	251.7
Intangible assets, net	195.7	42.0
Intercompany balances	1,423.7	1,430.1
Software, net	32.4	31.7
Other assets	142.1	147.7
Total assets	3,248.8	2,942.6
Liabilities and stockholders' equity
Debt payments due within one year	23.0	23.0
Other current liabilities	79.7	63.2
Long-term debt, excluding current installments	2,907.0	2,912.2
Other non-current liabilities	194.0	37.8
Intercompany balances	0	0
Stockholders’ equity	45.1	(93.6)
Total liabilities and stockholders’ equity	3,248.8	2,942.6
Guarantor Subsidiaries
Assets
Cash and cash equivalents	11.4	24.4
Restricted cash	11.8	10.9
Accounts receivable, net	132.1	135.4
Notes receivable, net	80.4	90.9
Inventories	64.4	59.6
Other current assets	90.0	95.0
Property and equipment, net	434.7	441.3
Investment in subsidiaries	0	0
Goodwill	484.3	464.6
Intangible assets, net	288.9	340.6
Intercompany balances	306.5	296.3
Software, net	239.4	251.4
Other assets	34.2	42.2
Total assets	2,178.1	2,252.6
Liabilities and stockholders' equity
Debt payments due within one year	0	0
Other current liabilities	151.9	174.9
Long-term debt, excluding current installments	0	0
Other non-current liabilities	75.7	121.2
Intercompany balances	0	0
Stockholders’ equity	1,950.5	1,956.5
Total liabilities and stockholders’ equity	2,178.1	2,252.6
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	114.8	73.3
Restricted cash	0	0
Accounts receivable, net	116.9	143.7
Notes receivable, net	63.5	67.8
Inventories	60.0	50.0
Other current assets	33.2	35.0
Property and equipment, net	196.0	192.9
Investment in subsidiaries	0	0
Goodwill	452.5	470.6
Intangible assets, net	25.4	26.6
Intercompany balances	0	0
Software, net	50.4	51.0
Other assets	328.9	370.4
Total assets	1,441.6	1,481.3
Liabilities and stockholders' equity
Debt payments due within one year	9.9	7.4
Other current liabilities	151.8	158.2
Long-term debt, excluding current installments	11.3	0
Other non-current liabilities	71.4	67.8
Intercompany balances	281.6	351.8
Stockholders’ equity	915.6	896.1
Total liabilities and stockholders’ equity	1,441.6	1,481.3
Eliminating Entries
Assets
Cash and cash equivalents	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	(2,911.4)	(2,759.0)
Goodwill	0	0
Intangible assets, net	0	0
Intercompany balances	(1,730.2)	(1,726.4)
Software, net	0	0
Other assets	0	0
Total assets	(4,641.6)	(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 non-current liabilities	0	0
Intercompany balances	(1,730.4)	(1,726.4)
Stockholders’ equity	(2,911.2)	(2,759.0)
Total liabilities and stockholders’ equity	$ (4,641.6)	$ (4,485.4)