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Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Components of net periodic benefit cost:        
Service cost $ 4.5 $ 7.6 $ 9.0 $ 15.5
Interest cost 14.4 35.0 30.4 72.0
Expected return on plan assets (19.7) (53.9) (41.8) (107.5)
Amortization of prior service credit 0.5 0.9 1.4 1.9
Net periodic benefit cost from discontinued operations 0.0 (4.0) 0.0 (7.6)
Net periodic benefit cost 11.6 3.2 235.5 11.1
Postretirement Benefit Plans [Member]        
Components of net periodic benefit cost:        
Service cost 0.1 0.4 0.2 1.1
Interest cost 2.7 4.8 5.4 10.9
Expected return on plan assets (1.7) (3.0) (3.5) (5.8)
Amortization of prior service credit 0.2 0.6 0.4 0.7
Net periodic benefit cost from discontinued operations 0.0 (1.4) 0.0 (3.1)
Net periodic benefit cost $ 1.3 $ 1.4 $ 2.5 $ 3.8