Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Investments, fair value	$ 1,961.7	$ 2,591.8
Liberty Global Group [Member] | Common Class A [Member]
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	272,572,110	252,766,455
Common stock, outstanding (in shares)	272,572,110	252,766,455
Liberty Global Group [Member] | Common Class B [Member]
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	10,805,850	10,472,517
Common stock, outstanding (in shares)	10,805,850	10,472,517
Liberty Global Group [Member] | Common Class C [Member]
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	646,703,723	584,044,394
Common stock, outstanding (in shares)	646,703,723	584,044,394
LiLAC Group [Member] | Common Class A [Member]
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	16,310,279	12,630,580
Common stock, outstanding (in shares)	16,310,279	12,630,580
LiLAC Group [Member] | Common Class B [Member]
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	540,089	523,423
Common stock, outstanding (in shares)	540,089	523,423
LiLAC Group [Member] | Common Class C [Member]
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	39,748,448	30,772,874
Common stock, outstanding (in shares)	39,748,448	30,772,874