Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Debt

Debt consists of the following:

			December 31
			2015			2014
	Interest Rates	Maturities	(in millions of dollars)
Long-term Debt
Senior Secured Notes issued 2007	Variable	2037	$	324.0		$	398.4
Senior Notes issued 1998	7.000%	2018	200.0			200.0
Senior Notes issued 1998	6.750 - 7.250%	2028	365.8			365.8
Senior Notes issued 2002	7.375%	2032	39.5			39.5
Senior Notes issued 2009	7.125%	2016	—			350.0
Senior Notes issued 2010	5.625%	2020	399.8			399.7
Senior Notes issued 2012	5.750%	2042	248.7			248.7
Senior Notes issued 2014	4.000%	2024	349.5			349.5
Senior Notes issued 2015	3.875%	2025	273.2			—
Medium-term Notes issued 1990 - 1996	7.000 - 7.190%	2023 - 2028	50.8			50.8
Junior Subordinated Debt Securities issued 1998	7.405%	2038	226.5			226.5
Fair Value Hedges Adjustment			(2.7		)	(0.2		)
Total Long-term Debt			2,475.1			2,628.7
Short-term Debt
Senior Notes issued 2005	6.850%	2015	—			151.9
Senior Notes issued 2009	7.125%	2016	350.0			—
Fair Value Hedges Adjustment			2.4			—
Total Short-term Debt			352.4			151.9
Total Debt			$	2,827.5		$	2,780.6