Intangible Assets, net and Goodwill - Reconciliation of the Carrying Amount of Goodwill (Details) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2018 USD ($) unit	Jun. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of reporting units | unit	9
Goodwill [Roll Forward]
Balance at the beginning of the period	$ 2,956.1	$ 2,956.1
Reporting unit reallocation adjustment		0.0
Acquired goodwill		376.4
Foreign currency adjustments		(19.7)
Balance at the end of the period		3,312.8
Gaming
Goodwill [Roll Forward]
Balance at the beginning of the period	2,475.5	2,475.5
Reporting unit reallocation adjustment		0.0
Acquired goodwill		0.0
Foreign currency adjustments		(8.4)
Balance at the end of the period		2,467.1
Lottery
Goodwill [Roll Forward]
Balance at the beginning of the period	356.2	356.2
Reporting unit reallocation adjustment		0.0
Acquired goodwill		0.0
Foreign currency adjustments		(1.8)
Balance at the end of the period		354.4
Interactive
Goodwill [Roll Forward]
Balance at the beginning of the period	124.4	124.4
Reporting unit reallocation adjustment		(124.4)
Acquired goodwill		0.0
Foreign currency adjustments		0.0
Balance at the end of the period		0.0
Social
Goodwill [Roll Forward]
Balance at the beginning of the period	0.0	0.0
Reporting unit reallocation adjustment	116.9	116.9
Acquired goodwill		0.0
Foreign currency adjustments		(1.8)
Balance at the end of the period		115.1
Digital
Goodwill [Roll Forward]
Balance at the beginning of the period	0.0	0.0
Reporting unit reallocation adjustment	$ 7.5	7.5
Acquired goodwill		376.4
Foreign currency adjustments		(7.7)
Balance at the end of the period		$ 376.2