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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Statement Of Cash Flows [Abstract]
Interest payments related to settlement of agreement				$ 417.0
Tax refund related to settlement agreement payment		$ 235.0	$ (930.0)
Excess tax benefits from settlement agreement	$ 38.0
Common stock shares issued in connection with settlement agreement	18