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Summary of Significant Accounting Policies - Inventory, warranty and other (Details) € in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016 EUR (€)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 EUR (€)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Inventory [Abstract]
Finished goods		$ 137.3			$ 137.3		$ 126.7
Work-in-process		12.4			12.4		14.0
Raw materials and supplies		64.6			64.6		58.5
Total		214.3			214.3		199.2
Revenue Recognition [Abstract]
Allowance for doubtful accounts included in accounts receivable, net		22.8			22.8		$ 23.3
Litigation settlement, expense	€ 15.5	17.4		€ 15.5	17.4
Foreign Exchange Forward
Revenue Recognition [Abstract]
Notional amount		42.1			42.1
Gain on derivative					$ 0.5
North America \| Pillows
Warranty Term [Abstract]
Warranty term (in years)				3 years	3 years
Non-prorated \| International \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)				5 years	5 years
Prorated \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)				10 years	10 years
Minimum \| North America \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)				10 years	10 years
Minimum \| International \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)				5 years	5 years
Minimum \| Non-prorated \| North America \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)				10 years	10 years
Maximum \| North America \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)				25 years	25 years
Maximum \| International \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)				15 years	15 years
Maximum \| Non-prorated \| North America \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)				15 years	15 years
Sales Returns
Sales returns [Roll Forward]
Beginning balance					$ 28.5
Amounts accrued					100.6
Returns charged to accrual					(96.2)
Ending balance		32.9			32.9
Warranty Reserves
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance					29.6
Amounts accrued					29.2
Warranties charged to accrual					(25.5)
Ending balance		33.3			33.3
United States Pension Plan
Revenue Recognition [Abstract]
Contributions to defined benefit pension plan			$ 10.0
Accounts Payable and Accrued Liabilities
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance					14.9
Ending balance		17.8			17.8
Other Noncurrent Liabilities
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance					14.7
Ending balance		$ 15.5			$ 15.5
Facility Closing \| Scenario, Forecast
Revenue Recognition [Abstract]
Restructuring expense expected						$ 7.0