Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income tax provision		$ 10.7	$ 2.7	$ 17.8	$ 24.7
Effective tax rates (as a percent)		45.30%	30.00%	29.30%	42.70%
Unrecognized tax benefits, excluding penalties and interest		$ 28.6		$ 28.6		$ 27.0
Portion of unrecognized tax benefits, which if recognized, would result in a reduction of the effective tax rate		14.8		14.8		12.8
Accrued interest and penalties related to uncertain tax positions		4.9		4.9		$ 3.6
Penalties and interest expense relating to unrecognized tax benefits		$ 0.0	$ 0.2	$ 1.1	$ 0.2
Subsequent Event
Repatriation of foreign earnings to the United States	$ 235.3
Subsequent Event | Expected
Incremental U.S. income tax related to repatriation	0.0
Subsequent Event | Amended Credit Agreement | US Dollar revolving loans
Outstanding balance on revolving line of credit, repaid	$ 129.5