Employee Benefit Plans (Change In Benefit Obligation, Change In Plan Assets And Components Of Funded Status) (Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 28, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in plan assets:
Plan assets — beginning of year		$ 484.0
Company contributions	$ 50.0
Plan assets — end of year		456.0	$ 484.0
Pension Benefits
Change in benefit obligation:
Projected benefit obligation — beginning of year		576.8	537.0
Service cost		1.7	1.6	$ 1.7
Interest cost		21.3	24.9	23.9
Actuarial (gain) loss		(18.3)	70.9
Benefits paid		(51.9)	(54.8)
Other		(2.2)	(2.8)
Projected benefit obligation — end of year		527.4	576.8	537.0
Projected salary increases		(1.7)	(3.5)
Accumulated benefit obligation		525.7	573.3
Change in plan assets:
Plan assets — beginning of year		484.0	472.2
Actual return on plan assets		(1.2)	47.8
Company contributions		25.8	20.1
Benefits paid		(51.9)	(54.8)
Other		(0.7)	(1.3)
Plan assets — end of year		456.0	484.0	472.2
Unfunded status at end of year		(71.4)	(92.8)
Health Care Benefits
Change in benefit obligation:
Projected benefit obligation — beginning of year		16.6	16.4
Service cost		0.0	0.0	0.0
Interest cost		0.6	0.7	0.6
Actuarial (gain) loss		(3.6)	1.3
Benefits paid		(1.2)	(1.7)
Other		(0.6)	(0.1)
Projected benefit obligation — end of year		11.8	16.6	16.4
Projected salary increases		0.0	0.0
Accumulated benefit obligation		11.8	16.6
Change in plan assets:
Plan assets — beginning of year		0.0	0.0
Actual return on plan assets		0.0	0.0
Company contributions		1.2	1.5
Benefits paid		(1.2)	(1.7)
Other		0.0	0.2
Plan assets — end of year		0.0	0.0	$ 0.0
Unfunded status at end of year		$ (11.8)	$ (16.6)