Condensed Financial Information of Parent Company Only Condensed Balance Sheets - Parent Only (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Mar. 07, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 68.4		$ 0	$ 15.6	$ 8.1
Accounts receivable	139.0		0.4
Related party	120.8		0
Total current assets	646.9		78.9
Goodwill	3,684.7	3,283.1	401.7	401.7
Investment in equity investments	270.8		61.1
Other assets, net	17.6		0
Total assets	10,097.3		2,309.8
Other current liabilities	92.1		38.8
Total current liabilities	480.4		77.5
Deferred tax liability	526.6		440.9
Members' equity	2,774.3		0
Total members' equity	6,971.1		1,783.7	2,002.0	1,901.3
Total liabilities and members' equity	10,097.3		2,309.8
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	58.8		0
Accounts receivable	0
Related party	2.4
Prepaid expenses and other	1.1
Total current assets	62.3
Goodwill	1,426.9
Investment in equity investments	1,723.0
Other assets, net	0.9
Total assets	3,213.1
Other current liabilities	2.2
Total current liabilities	2.2
Deferred tax liability	436.6
Members' equity	2,774.3
Total members' equity	2,774.3
Total liabilities and members' equity	$ 3,213.1