Capital Stock and Share Based Compensation Plans - Options outstanding and exercisable (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 7
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 11
Options on Shares Outstanding		8,011,380	10,094,622	10,502,083
Options on Shares Exercisable	3,370,048	8,011,380	10,094,622
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 9.46	$ 9.77	$ 9.62
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 9.46	$ 9.77	$ 9.62	$ 9.57
2004 - expire in 2014
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 10
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 11
2005 - expire in 2015
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 10
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 11
2006 – expire in 2014
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 10
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 11
2007 – expire in 2015
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 9
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 10
2008 - expire in 2016
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 7
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 10
Stock Options
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	1 year 8 months 16 days
Options on Shares Outstanding	3,370,048
Options on Shares Exercisable	3,370,048
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 9.46
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 9.46
Options Outstanding, Aggregate Intrinsic Value	$ 41.3
Options Exercisable, Aggregate Intrinsic Value	41.3
Stock Options | 2004 - expire in 2014
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	3 months 10 days
Options on Shares Outstanding	126,578
Options on Shares Exercisable	126,578
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 10.67
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 10.67
Options Outstanding, Aggregate Intrinsic Value	1.4
Options Exercisable, Aggregate Intrinsic Value	1.4
Stock Options | 2005 - expire in 2015
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	1 year 3 months 10 days
Options on Shares Outstanding	47,882
Options on Shares Exercisable	47,882
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 10.90
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 10.90
Options Outstanding, Aggregate Intrinsic Value	0.5
Options Exercisable, Aggregate Intrinsic Value	0.5
Stock Options | 2006 – expire in 2014
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	3 months 8 days
Options on Shares Outstanding	166,191
Options on Shares Exercisable	166,191
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 10.27
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 10.27
Options Outstanding, Aggregate Intrinsic Value	1.9
Options Exercisable, Aggregate Intrinsic Value	1.9
Stock Options | 2007 – expire in 2015
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	1 year 1 month 25 days
Options on Shares Outstanding	1,047,996
Options on Shares Exercisable	1,047,996
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 10.35
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 10.35
Options Outstanding, Aggregate Intrinsic Value	11.9
Options Exercisable, Aggregate Intrinsic Value	11.9
Stock Options | 2008 - expire in 2016
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	2 years 2 months 22 days
Options on Shares Outstanding	1,981,401
Options on Shares Exercisable	1,981,401
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 8.80
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 8.80
Options Outstanding, Aggregate Intrinsic Value	25.6
Options Exercisable, Aggregate Intrinsic Value	$ 25.6