v3.3.1.900
Defined Benefit Plans (Net Actuarial Gain Not Yet Recognized) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan, Net Actuarial Gain (Loss) Not Yet Recognized [Roll Forward]    
Actuarial gain (loss) not yet recognized, Pre-tax amount, Beginning balance $ 6.1 $ (5.2)
Actuarial gain (loss) not yet recognized, Tax benefit (expense), Beginning balance 0.5 1.6
Actuarial gain (loss) not yet recognized, Net-of-tax amount, Beginning balance 6.6 (3.6)
Change in net actuarial gain, Pre-tax amount (87.6) 12.7
Change in net actuarial gain, Tax benefit (expense) 16.7 (1.4)
Change in net actuarial gain, Net-of-tax amount (70.9) 11.3
Amount recognized as a component of net loss, Pre-tax amount (1.7) (0.8)
Amount recognized as a component of net loss, Tax benefit (expense) 0.3 0.1
Amount recognized as a component of net loss, Net-of-tax amount (1.4) (0.7)
Changes in ownership and other, Pre-tax amount 0.2 (0.6)
Changes in ownership and other, Tax benefit (expense) 0.0 0.2
Changes in ownership and other, Net-of-tax amount 0.2 (0.4)
Actuarial gain (loss) not yet recognized, Pre-tax amount, Ending balance (83.0) 6.1
Actuarial gain (loss) not yet recognized, Tax benefit (expense), Ending balance 17.5 0.5
Actuarial gain (loss) not yet recognized, Net-of-tax amount, Ending balance $ (65.5) $ 6.6