Capital Stock (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2016 shares	Dec. 31, 2015 USD ($) vote / share vote / shares $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Class Of Stock [Line Items]
Total Shares Authorized		360,000,000
Preferred Stock, Shares Authorized		10,000,000	10,000,000
Preferred Stock, Par Value | $ / shares		$ 0.01	$ 0.01
Phantom Stock Value Per Share | $ / shares		$ 3.33
Phantom Stock Units		860,244
Onex shares sold in secondary offering		22,915,300
SERP units		94,000	228,000
Treasury Stock, Shares, Acquired	1,000,000	5,700,000	4,000,000
Stock Repurchased During Period, Value | $		$ (300.0)	$ 129.2
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $		50.0
Stock Repurchase Program, Authorized Amount | $		$ 350.0
Class A [Member]
Class Of Stock [Line Items]
Common Stock, Shares Authorized		200,000,000	200,000,000
Common Stock, Par Value | $ / shares		$ 0.01	$ 0.01
Vote Per Share | vote / share		1
Class B [Member]
Class Of Stock [Line Items]
Common Stock, Shares Authorized		150,000,000	150,000,000
Common Stock, Par Value | $ / shares		$ 0.01	$ 0.01
Vote Per Share | vote / shares		1
Minimum [Member]
Class Of Stock [Line Items]
Sale of Stock, Price Per Share | $ / shares		$ 28.62
Maximum [Member]
Class Of Stock [Line Items]
Sale of Stock, Price Per Share | $ / shares		$ 35.90