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Income Taxes - Net Operating Losses and Income Tax Concessions (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 01, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income taxes
Net operating loss carryforward		$ 13.0	$ 4.8
Net operating losses		42.2	19.9
Valuation allowance		2.9
Annual capital in excess of par value pool of windfall income tax benefits related to employee compensation		0.0	1.0
Period applicable for additional special income tax concession	5 years
Decrease in foreign income taxes due to special income tax concession in Singapore		$ 5.0	$ 7.5	$ 6.2
Impact of income tax concession on basic earnings per common share (in dollars per share)		$ 0.07	$ 0.11	$ 0.09
Impact of income tax concession on diluted earnings per common share (in dollars per share)		$ 0.07	$ 0.10	$ 0.09
Pester
Income taxes
Net operating losses		$ 6.0
United States | Stock compensation
Income taxes
Net operating loss carryforward		1.6
Net operating losses		4.5
Foreign | Stock compensation
Income taxes
Foreign tax credits		0.0	$ 0.0
December 31, 2016
Income taxes
Net operating loss carryforward		0.1
December 31, 2020
Income taxes
Net operating loss carryforward		0.6
December 31, 2021
Income taxes
Net operating loss carryforward		0.1
December 31, 2022
Income taxes
Net operating loss carryforward		0.1
December 31, 2023
Income taxes
Net operating loss carryforward		0.3
December 31, 2024
Income taxes
Net operating loss carryforward		1.1
December 31, 2025
Income taxes
Net operating loss carryforward		0.1
March 31, 2032
Income taxes
Net operating loss carryforward		0.3
March 31, 2033
Income taxes
Net operating loss carryforward		0.5
March 31, 2034
Income taxes
Net operating loss carryforward		1.2
December 31, 2035
Income taxes
Net operating loss carryforward		5.6
Indefinite
Income taxes
Net operating loss carryforward		$ 3.0

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