Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:
Statutory U.S. federal income tax rate									35.00%	35.00%	35.00%
U.S. state income taxes, net of federal benefit									(0.40%)	1.40%	4.30%
Foreign earnings at lower rates than U.S. federal rate									(1.50%)	0.20%	(0.50%)
Impact of goodwill impairments									(0.10%)	(19.40%)	0.00%
Valuation allowance adjustments									(6.50%)	0.70%	13.20%
Other									(0.40%)	(0.20%)	0.60%
Effective income tax rate									26.10%	17.70%	52.60%
Valuation allowances against domestic DTA's									$ 37.1
Goodwill impairments	$ 69.0	$ 0.0	$ 0.0	$ 0.0	$ 67.6	$ 935.0	$ 0.0	$ 0.0	69.0	$ 1,002.6	$ 0.0
Gaming
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:
Goodwill impairments						$ 935.0			$ 0.0	$ 935.0