Significant Accounting Policies - Earnings Per Share (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share Reconciliation [Abstract]
Income from continuing operations	$ 15.2	$ (2.8)	$ 2.7	$ 0	$ 6.2	$ 10.8	$ (7.0)	$ (2.3)	$ 15.1	$ 7.7	$ 0.2
Income attributable to noncontrolling interest									(0.5)	0	0
Income from continuing operations, net of tax									$ 14.6	$ 7.7	$ 0.2
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]
Denominator for basic EPS - weighted average shares outstanding	48.6	43.1	43.1	43.0	42.9	42.6	42.4	42.4	44.4	42.6	42.4
Employee/director stock options and restricted stock units (in shares)									0.7	0.3	0
Weighted Average Number of Shares Outstanding, Diluted	49.2	43.8	43.7	43.6	43.5	43.3	42.4	42.4	45.1	42.9	42.4