Shareholders' Equity - AOCI (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	$ 732.9
Balance at end of period	670.4
Accumulated Other Comprehensive Income
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(44.2)
Other comprehensive income (loss) before reclassifications	13.9
Realized loss on reclassification, net of tax of $0.3 million	1.6
Net current period other comprehensive income	15.5
Balance at end of period	(28.7)
Realized loss on reclassification, tax	0.3
Foreign Currency Translation
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	3.2
Other comprehensive income (loss) before reclassifications	14.9
Net current period other comprehensive income	14.9
Balance at end of period	18.1
Pension Liability Adjustment
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(47.4)
Other comprehensive income (loss) before reclassifications	(1.0)
Realized loss on reclassification, net of tax of $0.3 million	1.6
Net current period other comprehensive income	0.6
Balance at end of period	(46.8)
Realized loss on reclassification, tax	$ 0.3