Shareholders' Equity - AOCI (Details) $ in Millions	9 Months Ended
	Sep. 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	700.9
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	26.2
Realized gain on reclassification, net of tax of $0.3 million	2.6
Net current period other comprehensive income	28.8
Balance at end of period	(15.4)
Realized gain 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	27.6
Net current period other comprehensive income	27.6
Balance at end of period	30.8
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	(1.4)
Realized gain on reclassification, net of tax of $0.3 million	2.6
Net current period other comprehensive income	1.2
Balance at end of period	(46.2)
Realized gain on reclassification, tax	$ 0.3