Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss, beginning balance	$ (152.2)	$ (127.3)
Other comprehensive income (loss) before reclassifications	(15.0)	(24.9)
Amounts reclassified from accumulated other comprehensive loss to net earnings (loss)	0.0	0.0	$ 2.6
Other comprehensive income (loss), net of tax	(15.0)	(24.9)	28.2
Accumulated other comprehensive loss, ending balance	(167.2)	(152.2)	(127.3)
Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(130.0)	(117.0)
Other comprehensive income (loss) before reclassifications	(1.0)	(13.0)
Amounts reclassified from accumulated other comprehensive loss to net earnings (loss)	0.0	0.0
Other comprehensive income (loss), net of tax	(1.0)	(13.0)
Accumulated other comprehensive loss, ending balance	(131.0)	(130.0)	(117.0)
Interest Rate Swap Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss, beginning balance	3.3	1.6
Other comprehensive income (loss) before reclassifications	(8.0)	1.7
Amounts reclassified from accumulated other comprehensive loss to net earnings (loss)	0.0	0.0
Other comprehensive income (loss), net of tax	(8.0)	1.7
Accumulated other comprehensive loss, ending balance	(4.7)	3.3	1.6
Pension Benefit Plan Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(25.5)	(11.9)
Other comprehensive income (loss) before reclassifications	(6.0)	(13.6)
Amounts reclassified from accumulated other comprehensive loss to net earnings (loss)	0.0	0.0
Other comprehensive income (loss), net of tax	(6.0)	(13.6)
Accumulated other comprehensive loss, ending balance	$ (31.5)	$ (25.5)	$ (11.9)