Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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, beginning of period	$ 171.8	$ 153.7	$ 109.0	$ 104.4
Restricted cash	27.2	10.9
Accounts receivable, net	468.4	346.0
Notes receivable, net	188.7	158.7
Inventories	265.6	137.8
Other current assets	256.3	150.3
Property and equipment, net	1,012.8	773.1
Investment in subsidiaries	0	0
Goodwill	4,108.3	1,183.1	801.4
Intangible assets, net	2,251.6	411.1
Intercompany balances	0	0
Software, net	592.7	343.5
Other assets	651.8	911.7
Total assets	9,995.2	4,236.4	2,186.9
LIABILITIES AND STOCKHOLDERS' EQUITY
Current installments of long-term debt	50.6	30.4
Other current liabilities	609.7	421.2
Long-term debt, excluding current installments	8,465.4	3,162.2
Other non-current liabilities	865.6	247.6
Intercompany balances	0	0
Stockholders’ equity	3.9	375.0	364.8
Total liabilities and stockholders' equity	9,995.2	4,236.4
Parent Company
ASSETS
Cash and cash equivalents, beginning of period	37.9	57.3	27.1	24.0
Restricted cash	0	0
Accounts receivable, net	0	0
Notes receivable, net	0	0
Inventories	0	0
Other current assets	65.4	13.9
Property and equipment, net	0.5	1.1
Investment in subsidiaries	4,730.7	1,962.5
Goodwill	0	0
Intangible assets, net	162.0	1.9
Intercompany balances	0	0
Software, net	15.6
Other assets	2.8	15.4
Total assets	5,014.9	2,052.1
LIABILITIES AND STOCKHOLDERS' EQUITY
Current installments of long-term debt	0	0
Other current liabilities	68.9	30.4
Long-term debt, excluding current installments	250.0	250.0
Other non-current liabilities	136.2	20.8
Intercompany balances	4,555.9	1,375.9
Stockholders’ equity	3.9	375.0
Total liabilities and stockholders' equity	5,014.9	2,052.1
SGI
ASSETS
Cash and cash equivalents, beginning of period	0.1	0	0.4	0.1
Restricted cash	0	0
Accounts receivable, net	61.8	66.9
Notes receivable, net	0	0
Inventories	35.2	28.2
Other current assets	20.2	10.5
Property and equipment, net	119.5	137.3
Investment in subsidiaries	953.4	796.5
Goodwill	253.6	251.7
Intangible assets, net	42.2	42.0
Intercompany balances	6,580.0	1,430.1
Software, net	32.9
Other assets	255.4	179.4
Total assets	8,354.3	2,942.6
LIABILITIES AND STOCKHOLDERS' EQUITY
Current installments of long-term debt	43.0	23.0
Other current liabilities	119.8	63.2
Long-term debt, excluding current installments	8,187.7	2,912.2
Other non-current liabilities	74.0	37.8
Intercompany balances	(0.1)	0
Stockholders’ equity	(70.1)	(93.6)
Total liabilities and stockholders' equity	8,354.3	2,942.6
Guarantor Subsidiaries
ASSETS
Cash and cash equivalents, beginning of period	28.8	26.8	2.4	2.4
Restricted cash	27.1	10.9
Accounts receivable, net	212.9	135.4
Notes receivable, net	136.6	90.9
Inventories	106.0	59.6
Other current assets	114.7	95.0
Property and equipment, net	651.1	441.8
Investment in subsidiaries	0	0
Goodwill	3,247.9	465.4
Intangible assets, net	1,761.8	340.6
Intercompany balances	0	296.3
Software, net	467.3
Other assets	96.8	293.6
Total assets	6,851.0	2,256.3
LIABILITIES AND STOCKHOLDERS' EQUITY
Current installments of long-term debt	0	0
Other current liabilities	247.2	176.2
Long-term debt, excluding current installments	0	0
Other non-current liabilities	593.7	121.2
Intercompany balances	1,637.9	2.4
Stockholders’ equity	4,372.2	1,956.5
Total liabilities and stockholders' equity	6,851.0	2,256.3
Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents, beginning of period	105.0	69.6	79.1	77.9
Restricted cash	0.1	0
Accounts receivable, net	193.7	143.7
Notes receivable, net	52.1	67.8
Inventories	124.4	50.0
Other current assets	56.0	30.9
Property and equipment, net	241.7	192.9
Investment in subsidiaries	0	0
Goodwill	606.8	466.0
Intangible assets, net	285.6	26.6
Intercompany balances	0	0
Software, net	76.9
Other assets	296.8	423.3
Total assets	2,039.1	1,470.8
LIABILITIES AND STOCKHOLDERS' EQUITY
Current installments of long-term debt	7.6	7.4
Other current liabilities	173.8	151.4
Long-term debt, excluding current installments	27.7	0
Other non-current liabilities	61.7	67.8
Intercompany balances	386.3	348.1
Stockholders’ equity	1,382.0	896.1
Total liabilities and stockholders' equity	2,039.1	1,470.8
Eliminating Entries
ASSETS
Cash and cash equivalents, beginning of period	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	(5,684.1)	(2,759.0)
Goodwill	0	0
Intangible assets, net	0	0
Intercompany balances	(6,580.0)	(1,726.4)
Software, net	0
Other assets	0	0
Total assets	(12,264.1)	(4,485.4)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current installments of long-term debt	0	0
Other current liabilities	0	0
Long-term debt, excluding current installments	0	0
Other non-current liabilities	0	0
Intercompany balances	(6,580.0)	(1,726.4)
Stockholders’ equity	(5,684.1)	(2,759.0)
Total liabilities and stockholders' equity	$ (12,264.1)	$ (4,485.4)